PCF8591 AtoD and the voltage meter

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Mark Niemann-Ross edited this page Jan 5, 2017 · 11 revisions

The voltage meter on the front panel of the circuit box is controlled by

npn transistor

<img src="https://github.com/mnr/rubberfish/wiki/images/pcf8591.jpg" width=500px">

<img src="https://github.com/mnr/rubberfish/wiki/images/voltageMeter.jpg" width=500px">

<img src="https://github.com/mnr/rubberfish/wiki/images/transistorGain.jpg" width=500px">

uxcell PCF8591 AD DA Converter Module Analog to Digital to Conversion

my version of the board

temp, light, a2d, d2a, jumpers, i2c

connecting to the raspberry gpio

---	---	---	---
voltage meter	Analog Out	gnd
	Analog in 3	gnd
	Analog in 2	Input 2
	Analog in 1	Input 1
	Analog in 0	Input 0
.

configuring the board

communicating with the device

References

In my free time, I write Science Fiction