ThomasIt's time for a status report :-)
| Requirement | Status | Comment |
| remote control through serial interface for multiple coordinated power supplies | Remote control works | The requirements for "multiple coordinated power supplies" must be refined.
EDIT: a 100nF bypass ceramics capacitor between GND and pin 2 of the LM317 must be retrofitted. Otherwise the serial communication won't work. |
| programmable on/off and at least two fixed voltage levels, optionally programmable output voltage | I can control on/off and two voltage levels with OUT! | I left the LED connected to PB4, but I'm not happy with the LED current. A damaged LED isn't the issue but the accuracy impact on STM8S
analog inputs is. Removing the LED is a possible solution. Other option: use a blue or white LED instead of red,
Changing the output voltage a with resistor connecting the LM2596 feedback loop and PC.3 (former LED in) works. 2 out! \ enable LM2596, 1st level
3 out! \ enable LM2596, 2nd level
0 out! \ disable LM2596 |
| monitoring of output voltage, and optionally output current | ain4= Vout * 18.4/V |
The resolution is about 54mV/digit, and there is just enough noise for some averaging. The resolution is sufficiently low for a range of about 56V. Great job guys ;-) |
| optionally measurement input voltage | ain2 = Vin * 18.4/V | Same as Vout To show it on the LED display I used this snippet: : Vin 2 adc! adc@ 100 * 184 / . ; ' Vin bg ! \ run Vin in background |
| 7S-LED status display | works | Segment DP is currently shared with the serial interface. I'd like to improve method for limiting the duty cycle |
| price per unit < $3 (excluding the external power source) | $1.51 + 1 x C 100nF + 10 cm wire + some SnPb | 3 more modules ordered for $1.48/pcs |
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