Added mouse bites for breakaway tabs

v2.3

added mouse bites for breakaway tabs

Added gnd current measurement inkl. simple low pass filter.

v2.2

 v2.2 finalized, spi connector added and ground current measurement s…

DIO1 and SPI Header added

Connected DIO1 between ESP32 and RFM95 as this pin is required for using the LMIC library.
Added a 2.54mm pitch SPI-micro-SD header

2nd version done and ordered

• Designed for a sleep current around 6 to 7 uA.
• ESP32
• RFM95 Lora Module
• 868MHz PCB antenna, can be cut off and replaced by an SMA connector
• AA size lithium battery driven: (LS14500 Lithium-Thionyl-Chlorid or LifePo4 possible)
• Boost converter to supply sensors with stable 5V. Can be switched off for low current sleep mode
• External connector for Onewire, analog inputs and I2C including ESD protection with very low current TVS diodes
• Sensing battery voltage. Can be disabled for low sleep current
• Red led for signaling activity
• Mechanical switch to select battery of external power supply
• Separate removable pcb section with wide range power supply 5 - 25V, USB-C connector and USB-UART adapter for programming