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--- sensor_power_from_usb_battery [2019/03/13 23:43] – created tell
+++ sensor_power_from_usb_battery [2019/03/14 14:18] (current) – tell
@@ Line 2: / Line 2: @@
 Power a sensor or other 5v thingy from one of those common portable battery-powered cellphone rechargers.
+Problem: those portable battery packs that output usb power for phone recharging have a **minimum** current requirement: draw too little and they figure the phone must be fully charged and they shut down completely.
 ====== Prototype ======
@@ Line 7: / Line 10: @@
 {{ :usbbattery-sensorpower.jpg?600 |}}
-(more later)
+TODO: explain
+====== Future/Improvements ======