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Analog API

float pin_adc_read(pin_t pin)​

Measures the current voltage on the given pin, and returns it. The pin must be set to ANALOG mode, otherwise the return value of this function is undefined. Note that Wokwi is a digital simulator with basic analog support, so there is currently very limited analog simulation. Some parts which support analog output include the potentiometer, NTC temperature sensor, photoresistor, and analog joystick.

void pin_dac_write(pin_t pin, float voltage)​

Sets the analog voltage on the given pin. Currently, the reference voltage for all the virtual ADCs is 5 volts (regardless of the MCU), so setting the voltage to 0 will return the minimum value, and setting the voltage to 5 will return the maximum value (that is 1023 on Arduino). This may change in the future.

This method can be called before setting the pin to ANALOG mode, but the voltage will only update once the pin mode is set to ANALOG.

Simulator examples​

  • Analog API chip example -- Simulates a 0-5V/0-ADC_MAX voltage source. One float attribute and one analog output.
  • Dual Op-Amp chip example -- Simulates a dual Op-Amp with 4 analog inputs, 2 analog outputs, 2 float attributes.
  • R-C filter -- Simulates a low-pass R-C filter with 1 analog input, one analog output, and 4 attributes.
  • Signal generator and Scope -- Simulates a signal generator with 5 attribute inputs and 1 analog output, and a scope with 4 digital inputs, 4 analog inputs and 4 attribute inputs. Chip code for both in Wokwi tabs. (Scope github)