PCF8591 Programming - Part 5 (Address/Control Byte Configuration)

 PCF8591 Programming - Part 5 (Address/Control Byte Configuration)

PCF8591 Programming - Part 4 (i2cdetect -y 1 PCF8591)

PCF8591 Programming - Part 4 (i2cdetect -y 1 PCF8591)

System Integration Design - Part 1 (Digital Potentiometer Module Review)

 System Integration Design - Part 1 (Digital Potentiometer Module Review)

Digital Potentiometer

PCF8591 Programming Part 3 - TDD (Test Driven Development) Do DAC first, and later quad DAC + ADC

  PCF8591 Programming Part 3 -  TDD (Test Driven Development)  Do DAC first, and later quad DAC + ADC

Design notes

My original plan was to use both ADC and DAC of pcf8591. On second thought I think I should first try DAC to output the sweep DC power voltage to tunnel diode, and use scope to display the wave form.  

But I have no idea if I should use the scope to check the 1k resistor to get the ampere data. 

Anyway, I think I will first try to repeatedly send a sweep voltage, say 0V to 10mV and see if ampere It increases.  

Bed time.  Will carry on tomorrow.

PCF8591 Programming - Part 2 (Schematic v0.3)

 PCF8591 Programming  - Part 2 (Schematic v0.3)

PCF8591 Programming - Part 1 (Address and Control Byte Summary)

 PCF8591 Programming - Part 1 (Address and Control Byte Summary)

PCF8591 ADC/DAC - Architecture，Schematic, and Datasheet Reference Links

 PCF8591 ADC/DAC - Architecture，Schematic, and Datasheet Reference Links

Now I am thinking of using the cheapy PCF8591 AD/DA module for testing the Tunnel Diode 2BS4A.

The DAC is used as adjustable PSU to tunnel diode.

The ADC two channels is used to measure the differential voltage across the tunnel diode.

References

(1) PCF8591 8-bit A/D and D/A converter Module - SunFounder

(2) PCF8591 Datasheet

(3) PCF8591 Rpi Tutorial