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QRP-LABS LightGateway Plus (Solar) 1.0 solar voltage input pin? #213

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opened 2026-10-05 05:50:14 +02:00 by adam · 2 comments
adam commented 2026-10-05 05:50:14 +02:00
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The firmware that comes with the qrp-labs module reports the solar panel voltage (as well as board temperature) in the standard beacon. When I flashed it with CA2RXU firmware, I don't know what pin that voltage maps to in order to configure "SEND EXTERNAL VOLTAGE" to provide the same data. To what do I need to set the divider values?
I dropped a note to Mustafa, but I haven't heard back from him, so I'm hoping that someone on this group might have knowledge of how to set up the "SEND EXTERNAL VOLTAGE" so that it reports the solar panel voltage.
Anyone?
Cheers and 73 - Jon N7UV

The firmware that comes with the qrp-labs module reports the solar panel voltage (as well as board temperature) in the standard beacon. When I flashed it with CA2RXU firmware, I don't know what pin that voltage maps to in order to configure "SEND EXTERNAL VOLTAGE" to provide the same data. To what do I need to set the divider values? I dropped a note to Mustafa, but I haven't heard back from him, so I'm hoping that someone on this group might have knowledge of how to set up the "SEND EXTERNAL VOLTAGE" so that it reports the solar panel voltage. Anyone? Cheers and 73 - Jon N7UV <!-- github-sync-id:3388933078 -->
adam closed this issue 2026-10-05 05:50:14 +02:00
adam commented 2026-10-05 05:50:15 +02:00
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was checking this:

but did not get any info about it

was checking this: ![](https://github.com/lightaprs/LightGatewayPlus-1.0/blob/main/images/light_gateway_plus_v_1_0_pinout.png) but did not get any info about it <!-- github-comment-id:3261936862 -->
adam commented 2026-10-05 05:50:15 +02:00
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Ok, I've resolved this with a little guidance from Mustafa. In his github repo for the board, the
variants/light_tracker_plus_v1/variant.h
shows

//For Solar Models Only
#define SOLAR_CHARGE_DISABLE_PIN 48
#define SOLAR_VOLTAGE_READ_PIN 7
#define SOLAR_ADC_MULTIPLIER 10.33

I then set battery section as follows:

Image

It took a little while to dial in the best ratio of divider values, but the setting I found is tracking within a few hundredths of a volt.

So I consider this issue closed.

Cheers and 73 - Jon N7UV

Ok, I've resolved this with a little guidance from Mustafa. In his github repo for the board, the variants/light_tracker_plus_v1/variant.h shows //For Solar Models Only #define SOLAR_CHARGE_DISABLE_PIN 48 #define SOLAR_VOLTAGE_READ_PIN 7 #define SOLAR_ADC_MULTIPLIER 10.33 I then set battery section as follows: <img width="803" height="435" alt="Image" src="https://github.com/user-attachments/assets/fdab8d5e-4f6d-4412-b397-73c894a72909" /> It took a little while to dial in the best ratio of divider values, but the setting I found is tracking within a few hundredths of a volt. So I consider this issue closed. Cheers and 73 - Jon N7UV <!-- github-comment-id:3339164815 -->
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Reference: adam/LoRa_APRS_iGate#213