Question on the Power Shield. Can you power it from the 3.7 Lipo? Or just charge a 3.7 Lipo?
Or it this just intended to provide a battery charger circuit to something ?
“You can power a Particle device with either a USB plug or a DC supply of anywhere from 7 to 20VDC and charge a 3.7V LiPo battery all at the same time.”
I want to power the particle with a 3.7v lipo and be able to charge it!
2 - 2032 Coin-cells == 6v -> Light just flashes green then D7 turns on DIM
1 - 3.7v lipo - works great
2 - AAA - 3v, not enough power
1 - 9v too much power…
Shouldn’t the Coin-cells work ?
I’d rather not use the Lipos as I then have to provide a charging solution. Plus all the small lipos are really meant for quadcopters so they all have strange connectors on them, nothing that will fit a wire-board solution.
Or you do go lower in voltage and power via 3V3 pin.
You could revisit the 1x 2032s this way, but the chip timing might get a bit off then, but 3V should be well above brownout threshold.
Power to the Photon is supplied via the on-board USB Micro B connector or directly via the VIN pin. If power is supplied directly to the VIN pin, the voltage should be regulated between 3.6VDC and 5.5VDC. When the Photon is powered via the USB port, VIN will output a voltage of approximately 4.8VDC due to a reverse polarity protection series schottky diode between V+ of USB and VIN. When used as an output, the max load on VIN is 1A.
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol Min Typ Max Unit
Supply Input Voltage VVIN +3.6 +5.5 V
Supply Input Voltage V3V3 +3.0 +3.3 +3.6 V
In another section it says:
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Min Typ Max Unit
Supply Input Voltage VVIN-MAX +6.5 V
So, I should be able to power it with 6v? It must be an amperage problem..
You might get away with 6V, but due to variances in components and also possible voltage spikes keeping further away from the absolute max voltage is recommended.
You usually find this difference in datasheets - often with max times how long the abs ratings can be tolerated but going over these either way might mean bye bye to your device.
I can save you the “click”, the AAA has 1200mAH and AA about 2400mAH. You need to consider every option to save energy if you plan to run on these batteries.