rusefi/firmware/controllers/lua/examples/dac.txt

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function onTick()
-- see stm32 reference manual to see which pins have DAC peripheral
-- 1.5 volts on channel 0 which is always PA4 on stm32f407
-- channel 1 would always be PA5 on stm32f407
-- make sure that your firmware is compiled with EFI_DAC=TRUE
setDacVoltage(0, 1.5)
setDacVoltage(1, 2.2)
end