HAREROD - Marcus Hasenstab - Elektronik Firmware Entwicklung EMV Dokumentation Übersetzung

Applications

Nowadays electronics are omnipresent. Sometimes, to complete a task, just a smart, compact component is missing.
In those cases a small enterprise can provide a fast and cost effective solution.
On this page we provide a selection of solutions that were developed over the years.

Zirconium CubeAutosampler
PCR-ControllerFast PCR-Thermocycler
Spectrometer340..850nm Spectrometer
LiIon Cell TesterHigh Precision Coulometry LiIon Cell Tester
ALDSPortable Medical Diagnostics System
PMA302010Mechanical Test Adapter
TQ412_melodySubminiature Melody Generator
EMI PreAmpEMI Wide-Band Pre-Amplifier
EMI Filter TestEMI Filter Test Boards
WLAN2UARTSerial-to-WiFi - Converter Platform
BLEsensorBluetooth Low Energy Sensor
SSI_USB_DUOConverter Platform
SSI_USBConverter Platform
L&S-Modulelight- and sound-module with motion sensor
Digital IODigital IO-Module
Loadcell ADCLoad Cell Data Converter
SteganoSquareData Collector with Ethernet
ASi-XceiverSeriell-to-AS-i - Bridge
SSI_TOOL1Converter Platform with FPGA
allTimerCustomer Specific Timer
TECLABDisplay Controller for Lab Instruments
ZirconiumControl Equipment for HPLC Analyser Pumps
HotDog5090Digital Temperature Controller for HPLC Column Oven
RFID_baseCompact RFID Base Station
TQ10_melodySubminiature Melody Generator
xmasball2012Floating Christmas Ball 2012
CentiPadEmbedded Linux Module
USS1701Ultrasonic Gas Flow Sensor
RS422splitterRS422 Encoder Splitter/Repeater
ShutterDigital Speed Control for Shutter Motor
MAHPONGMAHPONG TV-Tennis

Zirconium Cube Autosampler

application in High-Pressure-Liquid-Chromatography (HPLC) and Micro LC
a Zirconium System - product
- 2 or 6 sample racks
- Peltier cooling of sample chamber
- innovative cleaning system
- user friendly software
presented at ASMS 2021 in Philadelphia
development of electronics- and firmware by HAREROD
electronics
- motor controller for positioning and sample handling
- control of integrated cleaning system
- sample cooling
- 4 wide-range digital-inputs (5V..24V, up/down biased), 4 wide-range output-contacts (48V 250mA)
- RS-232 and Ethernet software control interfaces
firmware
- RTOS realtime operating system with dedicated thread for each sub-system (freeRTOS on STM32F4)
  - proprietary multithread XML script interpreter for flexible processing of injection methodes
  - RS-232 and Ethernet firmware control interfaces for device control and file transfer
  - sample chamber temperature control
  - XY-Z-injection-needle positionierung
  - control of integrated cleaning system, incl. washpumps and -valves
  - control of integrated dilutor piston
  - control of internal and external injection valves
- bootloader for encrypted, automatic firmware updates
- wear-leveling flash-filesystem for long field operating times (>10 years)
- automatic error correction class A typical, class B worst-case (e.g. after supply failure)

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Fast PCR-Thermocycler

This control unit for a high-speed PCR-thermocycler was designed while in lockdown early into the Covid19 pandemic. The core feature of the device is a disposable sample cartridge. In contrast to the well-known antigen quick-tests, this unit is based on the Polymerase Chain Reaction (PCR), which is designed to detect genetic footprints, in this application of the Covid19 virus, with high precision and sensitivity.
PCR-analysis requires two technical features:

To trigger the chemical process, two different temperatures (e.g. 55°C / 96°C) must be cycled.
The 520nm secondary emissions of the dye SYBR Green I must be separated from the background of a 497nm lightsource.

Within a few weeks a control unit and a sensor unit came into existence.

Hardware
- Sensor Unit
  - PMW lightsource 497nm
  - Edmund Optics Bandpass 520±2nm
  - Analog Frontend for Hamamatsu Sensor
- Peltier-/TEC Driver 12V 6A
- Heater Driver 12V 3,5A
- Fan Driver 12V PWM
- Supply 12V 10A
- 1x Thermocouple Input
- 2x 1wire Temperature Sensor DS18B20
- Digital Inputs internal
- Main Controller STM32F4 with freeRTOS
- WiFi-/BLE-Interface ESP32
- USB
- 3x Wide Range Digital Inputs 5V/12V external
- 2x Opto Coupler Outputs 60V 600mA, 1500V Insulation
- internal Control Data Memory
- internal Diagnosis
- Protection against operator error
- Protection against EMI
- Main PCB: 90mm x 96mm
Firmware
- Base Firmware for Testing
- Drivers for Peripherals' Control
- Production Firmware STM32/ESP32
- XML-based arbitrary Sequencer
- Web Interface

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Spectrometer

The work on the PCR-Thermocycler established a valuable contact to Hamamatsu Germany. This led to the procurement of a mini-spectrometer module for internal lab test use. Upon request, Hamamatsu provided original calibration data from their Japanese manufacturing.
The picture shows measurements on light sources with a provisionally working spectrometer. Later on the PCB was further populated and operates now as a bus-powered USB device.

Hardware
- Sensor unit
  - Hamamatsu C12880MA
  - CMOS Linear Sensor with 288 Pixels
  - Spektral Range: 340..850nm
- Sensor interface with pixel clock generator, signal puffer and 16bit 1MSPS ADC AD7980
- USB bus-powered
- UART Interface
- User Button
- 4x dimmable white illumation LED's
- 2x Digital Inputs
- Microcontroller STM32F4
- Case: Hammond 1591XXLS 83mm x 54mm x 39mm
Firmware
- production firmware
- drivers for peripheral control
- USB-VCOM host interface
Windows Software
- Sensor setup, Calibration, Autoscaling
- Investigation of Emission- and Absorption-Spectra

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High Precision Coulometry LiIon Cell Tester

Test device for LiIon Cell development in the automotive industry. Coulometric testing allows assessment of a cell's efficiency and ageing process over a wide range of application scenarios.
The picture shows the first 2-channel prototype. Within the same project Harerod provided designs for additional devices, e.g. TEC Cooler Controllers and Auxiliary Sensor Channels.
Outline
- Single LiIon-cell channel
  - Cell Voltage 0 .. 4.2V
  - Cell Current -20 .. +20A
  - Cell Temperature
  - 2x ADC 24bit AD7175-8
  - DAC 16bit AD5676
  - Reference Source LTC6655
  - Noisefree Resolution Voltage Measurement > 18.5bit
  - Noisefree Resolution Current Measurement > 17.6bit
  - Short Term Stability Current Control < 5ppm (100µA/20A)
  - Protection against operator error
  - Protection against EMI
- Supply 5.5 .. 7.0V 40A
- 2x RS485-Bus
- USB
- 2x Opto Coupler Outputs 60V 600mA, 1500V Insulation
- Status/Diagnosis LCD Interface
- 2MB internal Data Memory
- SDcard Interface
- Internal Diagnosis
- Microcontroller STM32F4
Firmware
- Base Firmware for Testing
- Drivers for Peripherals' Control

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Portable Medical Diagnostics System

Portable Lung-function Diagnostic Device
A Lothar MedTec - product
Portable measurement system for lung diagnostics, comprising of a signal generator unit and a sensor unit.
application interface signal generator unit
- ARM Cortex MCU for complex signal generation
- WiFi-/BLE-host communication
- energy- and standby-management
- Interfaces
  - WiFi-/Bluetooth-connection to host application
  - 2x Duo-LED
  - 1x key connector
  - power stage
- Supply
  - Li-Ion-accumulator cell pack
  - 5V USB charging system and pack manager
application interface sensor unit
- WiFi-/BLE-host communication
- energy- and standby-management
- interface
  - WiFi-/Bluetooth-connection to host application.
  - Duo-LEDs
  - transducers
- supply
  - Li-Ion-accumulator cell
  - 5V USB charging system and pack manager
dimensions
- divers PCBs between 20mm x 30mm and 130mm x 130mm, taylored towards mechanical design requirements
scope of work
- hardware development
- firmware framework development / driver energy management
- support firmware development WiFi-/BLE-controller
- development commissioning concept incl. programming adapter
- manufacturing management of functional model
- accredition preparation electrical part, DIN EN 60601-1-2
- support accredition tests electrical part, DIN EN 60601-1-2
  - electrical safety
  - safety Li-Ion-battery
  - electromagnetic compatibility, EN 60601-1-2:2015
  - ETSI EN 301 489-1 V2.2.0 (2017-03) / ETSI EN 301 489-17 V3.2.0 (2017-03)

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Control Equipment for HPLC Analyser Pumps

application in High Pressure Liquid Chromatography (HPLC)
development of the electronics hardware
support of low level firmware development
- integrated controller for external column heater
- 4 wide range digital inputs (5V..24V, up/down biased), 4 wide range digital output contacts (48V 250mA), 2 switched 24V power outputs
- RS-232, USB, and Ethernet switch (TCP/IP) software control interfaces
EMC design of overall system
- fitting circuit and layout
- selection of components, for example, power supply unit
- EMC compatible chassis optimization
- supervision/performance of EMI-tests
- supervision-/preparation UL/CSA/ETL-certification (electric/safety)

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Digital Temperature Controller for HPLC Column Oven

application in the High Pressure Liquid Chromatography (HPLC)
exact digital temperature control for highest reproducability of measurement results
cost optimized design based on Atmel AVR ATmega1284
communication via RS232 and Ethernet
development of the electronics hardware
support of low level firmware development

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PMA302010 - Mechanical Test Adapter

universal mechanical test adapter, adjustable to different devices under test
the fitting test device for professional quality control of your devices
design of the baseplate during the hardware design process, directly from device under test CAD data
transparent pricing - 50-65% typ. savings compared to third party suppliers
- exchangeable base plate
- leading, spring loaded guide pins
- spring loaded contact pins
- adjustable downholders
- plastic adjustment screws for optimum downholder force
- device under test specific electronics interface
technical data of standard adaptor (other dimensions available)
- footprint (B x T): 300mm x 200mm
- height: 100mm (w/out downholders)
- usable area: 255mm x 155mm
- mass: 2.5kg
- baseplate thickness: 10mm

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Subminiature Melody Generator

subminiature tone generator
- melody memory for 600 notes
- sensor input for e.g.
  - switch
  - light sensor
  - magnet sensor
- Class-D-amplifier
- Ultra-Low-Power
  - standby current below 1 µA
  - standby time at CR2032 several years
  - operating current ca. 4 mA plus speaker current
microcontroller ATtiny412
- SOIC8 package
- 4 kByte Flash
- 256 Byte SRAM
- 20 MHz
PCB
- 16.5mm diameter
- 2 layers, single sided SMD

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20dBm Wide-Band EMI Pre-Amplifier

HF-pre-amplifier with adjustable frequency response
SMA female connectors
cascadable 50Ω inputs/outputs
applications

EMI probe pre-amplifier
spectrum-analyzer tracking-generator pre-amplifier

parameters standard configuration

main frequency range 20MHz to 1GHz
output power 20dBm
idle power consumption 90mA * 5V

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EMI Filter Test Boards

testboard for the evaluation of HF-properties of electronic components
allows validation of datasheet parameters
verification of interaction between components
cost optimization by component comparision
reduces EMI design risk
configuration examples

line and supply filter / dampening filter

SMA female connectors
coplanar waveguide 50Ω
pi-filter structure with several SMD-pads

supply filter

SMA female connectors
coplanar waveguide 50Ω
pi-filter structure with several SMD-pads
pi-filter structure with THT-Pads
auxiliary pads for SMD-fuses and protection diodes

universal carrier

pads for SMA female connectors or coax
filter struktures can be directly applied by insulation milling

example: frequency response of standard ferrite under bias current

1000Ω 0603 ferrite
various additional capacitors
test protocol with pictures

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Serial-to-WiFi - Converter Platform

WiFi/IoT - adds WLAN / IP to any device and connects your application to the "Internet of Things"
- HTTP/webserver
  - provides wireless access via webbrowser from smartphone, tablett or laptop
  - uniform user interface for Windows, iOS, Android, Linux
- TCP/IP / UDP/IP
  - flexible and efficient access, for example, to sensor data
WLAN spezifications
- 802.11 b/g/n protocol
- Wi-Fi Direct (P2P), soft-AP
- Integrated TCP/IP protocol stack
- +19.5dBm output power in 802.11b mode
- Wake up and transmit packets in < 2ms
- Standby power consumption of < 1.0mW (DTIM3)
application interface
- 1x UART (3,3V or RS232)
- I2C (optional), SPI (optional)
- 2..7 digital inputs/outputs
- user key
- 2x LED
development environment
- open IDE Eclipse/GCC
- available for Windows 7 and Linux
- long-term project maintenance safety
requirements specific parts assembly options
supply voltage: 3,3VDC fixed or 4,5V..14VDC
supply current: self < 200mA, standby-current application dependant < 0.1mA
dimensions: PCB: 43x29mm (optional plastic case ca. 60x36xmm)

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Bluetooth Low Energy Sensor

compact Bluetooth sensor platform
- Texas Instruments CC2541F254RHAT
  - 2.4-GHz Bluetooth low energy System-on-Chip
  - Bluetooth 4 Low Energy Standard (BLE)
  - up to 2Mbps data rate
  - MCU Core 8051
  - simplified BT accreditation possible
- periphery
  - MPU-6050 6D-sensor
    - 3x acceleration
    - 3x gyro
- step-up-converter
  - dynamically adjustable
  - operating mode dependent MCU voltage
  - 1x AAA NiMH 800mAh
- MicroUSB-charging connector
  - charge logic
    - battery voltage measurement
    - charge current measurement
- operating mode display by two LEDs
- operating mode select by push button
Firmware
- BLE Stack by TI for IAR Embedded Workbench
- application specific extensions
- TI drivers, for example, for Win10 and iOS
current consumption: < 0.2mA standby, 0.5..20mA operation
dimensions: PCB 50x28mm (including battery ca. 50x42x13mm)

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SSI USB DUO - Converter Platform

flexible platform for customer specific converters, e.g.
- translation from ABZ to SSI
- SSI or ABZ scaling
  - e.g. 1000 pulses per revolution to 400 pulses per revolution
- SSI to RS232 or RS485
digital interfaces for up to 2xSSI / 2xABZ / 6xRS422 / 6xRS485
fast bidirectional drivers for up to 10Mbit/s
- achievable clock rates depend on the application (e.g. SSI-slave 2MHz, ABZ-scaling 1MHz)
communication 1x USB-device (optional RS232)
free logic configuration using ARM Cortex M4 Controller
requirements specific parts assembly options
power supply: via USB (opt. separate 5VDC or 24VDC).
current consumption: < 200mA
dimensions: 85x50.5mm (optional plastic case ca. 114x64x39mm)
SSI-products are listed at IB Kirchen

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SSI USB - Converter Platform

flexible platform for customer specific converters, e.g.
digital interfaces for up to 1xSSI / 1xABZ / 3xRS422 / 3xRS485
fast bidirectional drivers for up to 10Mbit/s
- achievable clock rates depend on the application (e.g. SSI-slave 2MHz)
communication 1x USB-device (optional 2x 3V3-RS232)
free logic configuration using ARM Cortex M4 Controller
requirements specific parts assembly options
power supply: via USB (opt. separate 5VDC-9VDC)
current consumption: < 200mA
dimensions: 68x43.8mm (optional plastic case ca. 87x57x39mm)
SSI-products are listed at IB Kirchen

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light- and sound-module with 6D motion sensor

light- and sound-module for theater
application interface
- ARM Cortex M0 MCU
  - STM32F051K8
  - 64kB Flash / 8kB SRAM
- interfaces
  - 3x Power-LED, 2A, PWM
  - audio amplifier 4 bis 8 Ohm, maximum 2W
  - 6D motion sensor
  - microSD-slot
  - 2x push button interface
  - serial interface, 3,3V-level
- power supply
  - single cell Li-Ion-Accu with 3,7V nominal voltage
- all connectors as SMD-pads 4mm x 2mm on PCB top
dimensions

PCB: 31mm x 21mm

scope of work

development hardware
development firmware framework/drivers
development test equipment: test adapter, test software
manufacturing of sample and pre-series

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Digital Input-/Output-Module

Bus enabled Digital Input-/Output-Module
Application interface
- ARM Cortex M0 MCU
  - STM32F051K8
  - 64kB Flash / 8kB SRAM
- 2x bus interface
- 4x configurable digital in-/outputs
- temperature sensor
- 1x status LED
- all connectors are WAGO 250 terminal block 1,5qmm RM3.5
Housing

case and cable entries protection IP67
material: aluminium

Dimensions

PCB: 90mm x 68mm
Case: 100mm x 100mm x 81mm

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Load Cell Data Converter

Bus enabled loadcell signal converter
Designed for official verification according to "International Recommendation OIML R 76-1 Edition 2006 (E)"
Application interface
- ARM Cortex M0 MCU
  - STM32F051K8
  - 64kB Flash / 8kB SRAM
- 2x bus interface
- 1x load cell
- calibration seal connector for hard firmware protection
- temperature sensor
- 1x status LED
- all connectors are WAGO 250 terminal block 1,5qmm RM3.5
Housing

case and cable entries protection IP67
material: aluminium

Dimensions

PCB: 90mm x 68mm
Case: 100mm x 100mm x 81mm

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Data Collector with Ethernet

Extendable module for multi-channel data collection.
Application interface
- ARM Cortex M4 MCU @ 168MHz
  - STM32F417VG
  - 1024kB Flash / 192kB SRAM
  - 168MHz
  - CRYPTO-Hardware
- 1x 100Mbps Ethernet
- 5x UART RS232 RX/TX
- 1x UART switchable RS232 / RS485
- 4x digital input, isolated, wide range 5V..28V
- 4x digital output, isolated, max. 28V 100mA
- 4x ADC, 12bit, 0..3,3V
- 1x SPI, 8x ChipSelect, 3,3V
- 1x I2C, 3,3V
- 1x SD/MMC Card
- battery buffered real time clock
- 1x status LED
- power supply 5V
- all connectors are WAGO 250 terminal block 1,5qmm RM3.5
Dimensions: PCB: 150mm x 135mm

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Seriell-to-AS-i - Bridge

AS-Interface, short "AS-i", means Actor-Sensor-Interface. It is an industrial fieldbus system, which transports data and power supply on two wires. Since 1999 AS-Interface is an international standard according to EN50295 and IEC62026-2.
Application example:
- power and data transport via two wires
- data protocol: RS232 115200 8N1
ASi-Xceiver is an AS-i development platform which implements the following functions without AS-i-ASICs:
- AS-i bus master
  - physical translation of Sensor/Actor-Data to AS-i
  - logical translation of Sensor/Actor-Data to AS-i- or proprietary protocol
- AS-i slave
  - physical translation of Sensor/Actor-Data to AS-i
  - logical translation of Sensor/Actor-Data to AS-i- or proprietary protocol
- AS-i power supply
  - injection of 24V supply voltage into the AS-i-bus
AS-i bus interface
- 62 devices
- data rate 160kBaud
- line length 100m (without repeater)
- WAGO 250 cage clamp 1,5qmm RM3.5
application interface
- ARM Cortex M0 MCU
  - STM32F030F4P6
  - 16kB Flash / 4kB SRAM
  - 48MHz
  - TSSOP20
- 1x UART (3,3V / RS232 / RS232 floating)
- 1x SPI (3,3V)
- 1x Status LED
- supply output 3,3V (400mA max.)
- supply output 24V (4A max.)
- WAGO 250 cage clamp 1,5qmm RM3.5
AS-i 24V power supply
- power supply input 24V (3A max.)
- AS-i data coupler (3A max.)
- WAGO 250 cage clamp 1,5qmm RM3.5
requirements specific parts assembly options
supply voltage range: AS-i bus voltage 16..34VDC
supply current: self < 40mA, standby-current application dependant < 5mA
dimensions: PCB: 85x56mm (optional plastic case ca. 114x64x29xmm)

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Display Controller for Laboratory Devices

display- and communications-unit for a high performance temperature maintaing equipment
circuit design and firmware development
- integrated STM32 controller for display, touch and backlight
- communications interface between host-PC and dedicated temperature controller
- staves programmable beeper, 2x case fan, 3 digital inputs, 1 floating digital output
- RS-485, RS-232 and VCP-/DFU-USB software control interfaces
a product of head electronic GmbH - the TEClab16-24
- presented at LASER World of Photonics 2013 in Munich

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allTimer - Customer Specific Timer

customer specific timer with LCD
- display range up to 99.99s
cost optimization by microcontroller application
- assembly language program
- instruction clock 8192 Hz
- LCD direct control (glass only, 3-fold multiplexing)
- program memory usage ca. 500 x 12 Bit
- data memory usage ca. 23 Byte
microcontroller PIC16F57
- 2048 x 12 Bit Flash
- 72 Byte SRAM
- 20 MHz max.
- SSOP28 package
battery runtime
- ca. 5000 operating hours using CR 2032
- supply voltage 2.8..3.3V
- supply current ca. 15..40μA
PCB
- 52mm x 35,5mm
- microcontroller
- LCD-interface
- battery holder
- up-/down voltage converter (optional)

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Compact RFID Base Station

industrial standard 125kHz RFID
- EM Microelectronic EM4095
- base modul for read/write
high range due to 2,8mH transceiver coil
- adaptable to customer specific coils
integrated Manchester-to-serial-decoder
- 5V-RS232, 9600 Baud
- adaptable to customer specific protocols
microcontroller ATtiny10
- SOT23-6 package 2mm x 3mm
- 1 kByte Flash
- 32 Byte SRAM
- 8 MHz
module size
- 26mm x 26mm x 3,5mm
development of hardware, firmware and test-/programming-adapter for IB Kirchen
- OEM-Produkt of IB Kirchen

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Subminiature Melody Generator

demonstrator for subminiature tone generator
- tone generator in assembly language
- melody memory for 200 notes
- minimal config is 4 SMD elements on ca. 1 square centimeter PCB
- sensor input for e.g.
  - switch
  - light sensor
  - magnet sensor
- ultra-low-power
  - standby current below 1 micro ampere
  - standby time at CR2032 several years
  - operating current ca. 1 milli ampere plus speaker current

microcontroller ATtiny10
- SOT23-6 package 2mm x 3mm
- 1 kByte flash
- 32 Byte SRAM
- 8 MHz
PCB Demonstrator
- 26mm x 11mm
- microcontroller
- PWM-amplifier and filter(optional)
- voltage regulator (optional)
PCB with CR2032 battery holder
- 29mm x 24mm
- microcontroller
- PWM-amplifier and filter(optional)
- push button

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Floating Christmas Ball 2012

Demonstrator for compact control application
- PD-controller in assembly language
microcontroller ATtiny10
- SOT23-6 package 2mm x 3mm
- 1 kByte flash
- 32 Byte SRAM
- 8 MHz
PCB
- 50mm x 11mm
- microcontroller
- PWM-amplifier
- current measurement amplifier (optional)
- power supply

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SSI TOOL 1 - Converter Platform with FPGA

flexible platform for customer specific converters
digital interfaces for up to 2xSSI / 2xABZ / 6xRS422 / 6xRS485
fast bidirectional drivers for up to 10Mbit/s
precision analog inputs up to 2x 24bit +/-10V
communication 1x RS232
free high speed logic configuration due to FPGA
optional integration of XILINX PicoBlaze microcontroller inside FPGA
requirements specific parts assembly options
SSI-products are listed at IB Kirchen

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CentiPad - Embedded Linux Module

AT91RM9200 ARM9 CPU / SDRAM / Flash / miniSDcard
communication:
- LAN / seriell / USB / Sound
interfaces:
- address-/data-Bus / I2C / SPI / 1wire / CAN
1,1W typical power demand
94mm x 62mm
CentiPad was developed as a platform for HAREROD customer applications
- recent application e.g. as development platform for the Finnish AALTO-1 satellite

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Ultrasonic Gas Flow Sensor

conversion of a LabVIEW setup into a cost efficient small appliance
analog frontend for ultrasound transducers
digital signal prozessor TMS320F2812
- signal acquisition and processing (Assembler)
- command interpreter (C)
system interface: 5V sensor supply and RS232 interface

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RS422 Encoder Splitter/Repeater

Splits ABZ-Encoders into two RS422-outputs
additional TTL-output
signal reconstruction
application specific maximum data rate: 250kbps, 2.5Mbps, 20Mbps
EMI protection
self supply viw wider range SEPIC-converter 4,5V..29V
sensor supply (output): 5V, 400mA

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Digital Speed Control for Shutter Motor

application for medical gas analysis
replacement of an analog DC motor control by 8pin ATtiny15
simpler commissioning and better long term stability
longer life time due to additional motor fitness functions
significant cost reduction

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Control of a Portable Nutrition Pump with Microcontroller

application in medical patient nutritioning
replacing an analog DC motor control by 8pin PIC12
simpler commissioning and better long term stability
improved performance
significant cost reduction

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MAHPONG TV-Tennis

often build, fun for the whole family
BAS-video-generation in AVR-Assembler
link to German MAHPONG-Seite

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HAREROD[hɐ:ɾe:ɾod]

Applications

Digital Speed Control for Shutter Motor

Control of a Portable Nutrition Pump with Microcontroller