Once again, in about 2019, eBay suggested I buy some DigiSparks. At the price suggested, 1.69 GBP, it was worth a go. They sat in my box of bits, awaiting a use.
The serial Port example did not work but the keyboard example did.
The Arduino documentation has a USB keyboard example.
There was a similar example for the DigiSpark.
They are super for HID keyboard automation. I have needed to reflash the bootloader once or twice.
AutoType describes using two to type across a service where both people TYPE and READ their conversation.
Note ( 2024-09-01 ): http://digistump.com is refusing connection. So the examples about installing below need updating.
See this: https://github.com/digistump/DigistumpArduino/issues/167
This is used in preferences instead.
https://raw.githubusercontent.com/digistump/arduino-boards-index/master/package_digistump_index.json
And https://forum.arduino.cc/t/digistump-digispark-no-longer-available/1234095 - helpful
Original help on Adding DigiSparks to Arduino IDE.
https://www.instructables.com/Digispark-DIY-The-smallest-USB-Arduino/
This is very helpful: http://digistump.com/wiki/digispark/tutorials/connecting
Drivers and firmware: https://github.com/micronucleus/micronucleus v2.04
https://github.com/digistump/DigistumpArduino - more information
In the box labelled "Additional Boards Manager URLs" enter: http://digistump.com/package_digistump_index.json
As the link above no longer, works try:
https://raw.githubusercontent.com/digistump/arduino-boards-index/master/package_digistump_index.json
https://drazzy.com/package_drazzy.com_index.json
This worked on 2025-08-26.
The DigiSparkCDC examples do not work. They Blue screened my Win10 PC back in 2019. On 2024-09-01 they compile, but Windows complains that Windows does not recognise the Device.
Use a Leonardo instead.
The Arduino Leonardo can enumerate as a Keyboard, Mouse and Serial Port, and also has the digital inputs and AtoD converters.
The workstation received an incoming call and at the end of the call, the advisor has to press a button or key to move onto the next call.
A source of calls could be used overnight, but the workstation needed a device to press this button to so it could handle the next call.
It might be possible to get the workstation to output to the serial port enumerated when the Arduino is plugged in.
Altenatively using one of the Arduino's inputs could be used.
Reading the screen is a challenge. The Arduino Leonardo or DigiSpark offered a solution.
A light dependent resistor was used to detect in incoming call when the Workstation screen changed, and it could trigger a DigiSpark to press the keys to make the workstation ready for the next call.
I got this when using the board manager and Win10: "CRC error, file corrupted. Try to repeat later"
This helped. https://github.com/arduino/Arduino/issues/9719
I deleted C:\Users\doug\AppData\Local\Arduino15\library_index.json
When I next opened the IDE it seemed to have installed the new boards.
C:\Users\doug\AppData\Local\Arduino15\library_index.json ~/.arduino15/library_index.json
https://github.com/arduino/Arduino/issues/9719 - Win10 reports CRC error
Another may be related problem. The iPhones would not take any updates and failed.
My ISP suggested I upgrade and it seemed to fixed the iPhone update issue.
My old ADSL2 router was replaced by a router that supported FTTC.
I installed DigiSpark into the Arduino IDE over the new router onto a new Windows computer with no issues.
