Shared Projects

Energy Harvesting Board 1.0 (EHB-10)

• BQ25570 power harvesting breakout with TPS61220
• Solar cell input to charge Li-ion or supercap
• 5V and 3.3V output.

Will update w/ github link

A very accurate emulator. This version has a keyboard and display circuit that is the same as the original calculator, download SinclairScientific5 from github to make it work.

Uses an Arduino Nano or clone.

RKO/RKN are 4.7K, this is just a path to ground for the ADC.
R1..8 are 1K, smaller resistors makes it brighter

Buttons are standard 6x6x5mm.
You can also use 6x6x4.3mm to make the keys a little harder to push, like the original calculator.
For more accuracy, use blue for numbers and white for everything else.

Uses 3 displays type: 2352B / 2352BS
https://www.aliexpress.com/wholesale?SearchText=0.25"+RED+7+Segment+display+3+Bit

Power Switch is:
https://www.aliexpress.com/wholesale?SearchText=L8.5*W3.5MM+3P+2T+Mini+Toggle+%2F+Slide+3mm

Power comes from a 4 AAA battery holder attached with double sided sticky tape to the back of the keyboard, The width of the holder should be 50mm or less

4 M2 hexagonal standoffs keep it off the table.

Source code:
https://github.com/arduinoenigma/ArduinoNanoSinclairScientificCalculator/tree/master/SinclairScientific5

Hackaday.io page:
https://hackaday.io/project/91895

Tindie Store:
https://www.tindie.com/stores/arduinoenigma/

Schematic:

This version has a KIM 1 keyboard and display circuit. Download SinclairScientific1 from github to make it work. For the most accurate version, see https://oshpark.com/projects/OSfM0RLN

Uses an Arduino Nano or clone.

RKO/RKN are 4.7 K, this is just a path to ground for the ADC.
R1..8 are 1K, smaller resistors makes it brighter

Buttons are standard 6x6x5mm.
You can also use 6x6x4.3mm to make the keys a little harder to push, like the original calculator.
For more accuracy, use blue for numbers and white for everything else.

Uses 3 displays type: 2352B / 2352BS
https://www.aliexpress.com/wholesale?SearchText=0.25"+RED+7+Segment+display+3+Bit

Power Switch is:
https://www.aliexpress.com/wholesale?SearchText=L8.5*W3.5MM+3P+2T+Mini+Toggle+%2F+Slide+3mm

Power comes from a 4 AAA battery holder attached with double sided sticky tape to the back of the keyboard, The width of the holder should be 50mm or less

4 M2 hexagonal standoffs keep it off the table.

Source code:
https://github.com/arduinoenigma/ArduinoNanoSinclairScientificCalculator/tree/master/SinclairScientific1

Hackaday.io page:
https://hackaday.io/project/91895

Tindie Store:
https://www.tindie.com/stores/arduinoenigma/

Updated layout, pin outs. This design is not tested.

Features: - MCP73831T-2ACI: Single Cell Lipo Charging - AP2112k-3.3: LDO, 5v-3.3v Regulator - SPI Flash, (Makes this a “Trinket M0 Hackspress”) - All pins available as a test pad or as a pin

ATSAMD21E board based on the “Trinket M0” by Lady Ada/Adafruit Industries.

Creative Commons Attribution, Share-Alike license, Derivative of “Trinket M0” (https://www.adafruit.com/product/3500)

https://github.com/eighthree/espress0

Hothouse v1.4

A comical add-on board for the Raspberry Pi. Once assembled with LEDs, resistors and a switch, you can program the second LED to light up whenever the American President sends a tweet (like a warning to the world). If you’d rather not know, use the switch to turn off the script (with the 2nd LED as a script on/off indication light). “Make PCBs great again!”.

More details, BOM and some example code here: http://averagemaker.com/2018/04/the-trump.html

4x6 LED Matrix for ATTiny104 Xplained

A simple breakout for a 2x10 0.05" SMT header

A simple test board to play around with STM8L. Some buttons, LEDs and expansion headers. Not super practical, it’s just for learning

4-Pin SWIM to 0.68mm pogo adapter

2x3 ICSP to 0.68mm pogo adapter

Vectrex Controller Board

SOT-23-5 (package SOT95P284X122-5N) to Breadboard. (Side to side pin spacing 0.300".) For example for the Texas Instruments LM4132BMF-4.1. Use with standard 0.025" square pins such as one Amphenol FCI 68000-103HLF and two Amphenol FCI 68000-101HLF, or easy to breadboard machined pins such as one Samtec BHS-103-G-A and two Samtec BHS-101-G-A, or even Arduino Shield style stacking connectors one Samtec ESQ-103-38-G-S and two Samtec ESQ-101-38-G-S

See https://github.com/nTrfAce/SnapEDA for design documents.

SOT-23-6 (package SOT95P280X145-6N) to Breadboard. (Side to side pin spacing 0.300".) For example for the Microchip MCP4022T-103E. Use with standard 0.025" square pins such as 2x Amphenol FCI 68000-103HLF, or easy to breadboard machined pins such as 2x Samtec BHS-103-G-A, or even Arduino Shield style stacking connectors 2x Samtec ESQ-103-38-G-S.

See https://github.com/nTrfAce/SnapEDA for design documents.