Krait firmware update procedure
Ewa expander module now supported
Note: if the module doesn’t start to run after update, check the clock menu (by pressing < + > simultaneously) Make a desired settings for clock source there.
1. Download latest firmware and Loader App here.
2. Install Teensy Loader app on you computer: For MAC users Mac OS X 10.10 and later is needed.
3. Connect Krait to computer via USB
4. Run Teensy Loader.
5. Drag .hex file on Teensy Loader. If you see a message that “hex is too large” just ignore it.
6. Take a needle or toothpick and press a button hidden inside Krait. There is a tiny hole on a PCB for it, see the picture.
Arrow buttons in the app should become active. Press this button:
Wait for a message "Download complete" in app.
Press this button:
Wait for the message "Reboot Ok".
Your Krait is flashed with new firmware now. Usually it is not necessary to make calibration after that, but sometimes this can happen.
Calibration procedure:
Calibration is quite straightforward, but you will need a multimeter:
1.Power off module. Power On while holding SET button.
2. You will see a calibration page with channel number (1), reference voltage (-5v) and associated output value. Connect the multimeter to channel 1. Rotate pot and use <> buttons for fine tune until you get -5v on the multimeter. Press the big button to confirm and go to the next step. Now rotate the pot until you get 0v on the multimeter. Press the big button again and rotate the pot to get +5v. Press the big button, reconnect the multimeter to channel 2 and repeat the steps above. Then connect to 3 channels and repeat.