Low power mode #1
Description
I checked carefully my connections to the torque sensor. As we can see from the lab power supply, it uses near 10mA @5v, that is 0.05Wh. So, 1.2W a day, 36W a month. So the torque sensor alone will discharge 10% of my battery in a month. This means we will need a way to turn off the EBike board (and VESC ??) as most as possible. For initial phase, I can use the button on my Dengfu E10 frame the turns off my BMS output. But ideally, the system should power off itself after some timeout of not being used, like after 1 our 4 hours (assuming the user forgot to turn off the EBike on the display, my wife does this a lot):
The full board as it is actual, with throttle connected as also the torque sensor, with the VESC, uses near 0.1Wh, so 72Wh in 1 month.
Some ideas from other users:
- shut down the 5V power rail, so that would eliminate consumption from a lot of peripherals... bluetooth, torque sensor, temp sensors, etc.
- something missing on most of the vescs. There is but some workaround:
- having a separate power supply line for the nrf and the vesc. The nrf is always on, can directly open the battery switch from the can or a simple mosfet high/low switch.
- having an extra board with mosfet switch controlled externally.
- use one output port of the vesc to switch the secondary rail (5V) on and off with a little mosfet switch, that would kill all peripheral except the nrf.
I currently have a switch on my bms/battery. that's the easier way (specially avoid spikes and connector drama).