OTA WeMos CH340 D1 WiFi Arduino UNO R3 Development Board ESP8266 ESP-12E
You may need the pull-up resister on iO15 pin and Put boot select switch H/L on IO0 pin to use this board
Read page 34 of Hardware User Guide of this wifi unit.
boost inverter arc ignition coil cigarette lighter voltage generator kit B6-002
Need power line bypass capacitor for arc ignition
Need power line bypass capacitor between the emitter of transister to the transformer Vcc line as usual.
USB Charging Current Voltage Detector Tester Meter Phone Mobile Power Supply
0.3 ohm internal impedance recovers my Nexus 2012 charge current problem