I have the Seeeduino Stalker v2.1 and the SEN51035P Temperature/Humidity sensor. I load up the code from the wiki: seeedstudio.com/wiki/Grove_- … Sensor_Pro
The code compiles fine and works fine when connected to the computer. But when the stalker is running on Li ion battery and removed from the computer, this function does not print the temperature/humidity values to the sensor.
I think one of the two dht11 conditions are not met, and so, no output comes out. As soon as I connect the stalker to the computer through the USB, it is able to write onto the SD card.
My Li ion battery is fully charged, so it cannot be an issue with the battery. Also, other sensors (Grove Hall sensor works just fine when running on Li ion battery) Can you please help here.
Further debug showed that the battery was fully charged and showing 4V. When I connect the stalker to the computer through USB, the USB5V showed a voltage of 4.6V. But when I disconnect from the computer, the USB5V showed a voltage of 2.5V. So, clearly for some reason, the battery when supplying voltage to USB5V is not supplying full voltage to the sensor and hence it is not working.
Please explain how the battery voltage comes to the USB5V?
Please help here, because I need to finish my application fast.