Sinclair Scientific Calculator Oshpark Edition
author: ArduinoEnigma
2 layer board of 2.01 x 4.41 inches (51.0 x 112.0 mm)
Uploaded:
June 26, 2018
Shared:
July 10, 2018
Total Price:
$44.30
A very accurate emulator, the physical size, keyboard and display circuit are the same as the original calculator.
Download SinclairScientific7 from GitLab.com to make it work. Uncomment line 52 (#define CommonAnode) and comment line 53 (#define CommonCathode) in SinclairScientific7.ino
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://gitlab.com/arduinoenigma/ArduinoNanoSinclairScientificCalculator/tree/master/SinclairScientific7
Hackaday.io page:
https://hackaday.io/project/91895
Tindie Store:
https://www.tindie.com/stores/arduinoenigma/
Schematic:
A very accurate emulator, the physical size, keyboard and display circuit are the same as the original calculator.
Download SinclairScientific7 from GitLab.com to make it work. Uncomment line 52 (#define CommonAnode) and comment line 53 (#define CommonCathode) in SinclairScientific7.ino
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://gitlab.com/arduinoenigma/ArduinoNanoSinclairScientificCalculator/tree/master/SinclairScientific7
Hackaday.io page:
https://hackaday.io/project/91895
Tindie Store:
https://www.tindie.com/stores/arduinoenigma/
Schematic:
