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DiPho

Digital Photodiode with wired and wireless interfaces

Design files (schematics, PCB layouts, BOMs) can be found at DiPho/releases.

Overview

Enclosure: SM1 thread 25mm tube

Two-board design

1. sensor board:

• Photodiode, SFH 2201 / BPW34
• photocurrent: 10 µA to 10 mA
• TIA based on a fast opamp, BW of tens of kHz, gain selectable in decades
• gain controlled via a rotary switch available from outside
• log amplifier version based on ADL5304ACPZ
• coaxial connector
• supply connector

2. digital board

• USB-C (console, supply)
• Ethernet (MQTT, passive PoE,over USB-C)
• STM32 CPU

3. Optional adapter board

• Ethernet + PoE
• USB console + supply