Senior Member
Joined: 13/08/2024
Location: NetherlandsPosts: 104
| Posted: 04:02pm 30 Oct 2024 |
I built the circuit as indicated in the KiCad schema but it did not work. I read somewhere on the net that these Sony sensors sometimes gave problems due to the presence of dried out capacitors, so I dismantled the sensor. There appeared to be no capacitors in it. I wanted to know the details and made a simple circuit to measured the sensor with an oscilloscope. It appeared that the sensor did work, but that there was a square wave on the output. After I had modified the circuit with a DTC144E (level shifter) transistor and had offered the signal to the Pico, the signal was converted. The Sony sensor does work but to a certain extent. PON and POF buttons were not read by the Sony. Values did come through but not all buttons were read correctly. With another sensor, for example the HRM36002P, which looks like a TSOP1738, all buttons were read. I am not stuck with the original Sony sensor and therefore choose the sensor that gives the best result.
The square wave at the output of the Sony SBX1619-52.
Signal from the Sony sensor.
Signal from the HRM36002P sensor.
The Sony sensor.
Next step is changing the KiCad drawing.