Open alexeiaburgos opened 8 months ago
Within Stage 1 testing, the receiving end of the board is at 1.8V voltage, seeing a voltage drop from the wire. The ethernet cable has an internal resistance between the VCC & GND of 350 ohm. To mitigate this voltage drop, we can decrease the current flowing through the cable by increasing the resistor values of the receiving and transmitting boards by a factor of 10. This will decrease the flow of current that is approximatively 3 mA to 0.3 mA, thus reducing the voltage drop across ethernet cable
Stage 1 - Used another ethernet cable, the I2C Extender was able to power the sensor and communicate properly. The internal resistance between VCC & GND was zero measured at 0 ohms across the wire. The internal resistance between wires on the VCC/GND was measured at 7 ohms.
Stage 2 - Casey tested I2C Extender with SHT: Current draw was 1mAh and 9mWh over 3 minutes
Stage 3 - Tested with Osmopod w/ cable length of 20ft. Instantaneous Current draw was 32 mA. Osmopods are having issues initializing. Next step would be to do a field installation