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December 26, 2014 AT 1:00 am

Raspberry Pi board Test Jigs #makerbusiness #piday #raspberrypi @Raspberry_Pi

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Brian Dorey shared about the Raspberry Pi board test jigs his team has been selling over at www.abelectronics.co.uk — helpful suggestions!

…In the past few months the sales of the ADC boards has greatly increased and so we experimented with the Arduino Uno to make a more complex test jig for the ADC boards and including a LCD screen to show the status of the board being tested and any errors in addition to basic Pass/Fail LEDS on the tester.

The new ADC Pi and ADC Pi Plus tester is a single board design which uses an ATmega328 processor to communicate with the board being tested via I2C and also with the LCD display. The tester has a precision voltage reference at 2.048V which is connected to the board being tested via pogo-pins.

The code on the ATmega328 then checks each analogue input 3 times to verify the input voltage and displays the input status on the LCD screen if it is within tolerance.  If one or more of the ADC readings falls outside of range the LCD shows either H for high voltage or L for a low reading.

If the tester cannot communicate with the board being tested the LCD shows I2C Error which normally indicates a soldering issue with the level shifter mosfets or pull-up resistors…..

Read more about their tester building and tuning back at his site.

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