HW Test 2.0

[besi]

• LED works
• UART and Charger work
• Onboard One Wire Sensor works
• OneWire through 3.5mm jack
• I2C device
• Button A and B
• SPI
• Lightsensor

Issues

• The device can't be used without a battery since the tp4056 switches the load off if there is no battery
• Silkscreen is very small
• QR Code has some label on top
• One Wire requires reinforcement
• Charging indicator would be nice
• Show which position is "ON" and which one is "OFF"