One of two WrenDAQ2 circuit boards. This board has a current sensor (marked U1), a switching power supply module (marked U2), crowbar over voltage protection, and a AC frequency pickup. It connect to the other circuit board with a 10 pin ribbon cable p...

One of two WrenDAQ2 circuit boards. This board has a current sensor (marked U1), a switching power supply module (marked U2), crowbar over voltage protection, and a AC frequency pickup. It connect to the other circuit board with a 10 pin ribbon cable plugged in to J2. The brass hardware on the left attaches the 900 MHz antenna. The white wires on the right are to the weatherproof sensor connector.