Electro-Osmotic Concrete Drying Design
Budget: $250 – $750 USD
Electro-Osmotic Drying System – Electronics Specification
Electro-Osmotic Drying System – Electronics Specification
Client: Frode Evje – Norway
Project Scope
Electro-Osmotic Pulse (EOP) concrete drying system for moisture control in underground walls and foundations.
Design required for:
8 electro-osmotic channels
Current regulation
Polarity reversal
Full telemetry and cloud logging via Particle Photon
1. Functional Requirements
• Independent constant-current output per channel (8 channels)
• Adjustable drive current: 100–300 mA per channel
• Voltage output compliance: up to 24–30 VDC
• MOSFET H-bridge per channel (3–5 A rating)
• Automatic polarity reversal every 60–120 min
• Dead-time between polarity states: 2–5 seconds
• Integrated surge protection: TVS + RC snubber
• Per-channel resettable PTC fuse
• Per-channel status LED (active / fault)
image.png
2. Power Architecture
• Power supplied from external certified DIN PSU (230VAC→24VDC)
• No mains voltage on PCB
• On-board DC regulation:
• 24V → 5V buck converter
• 5V → 3.3V LDO (low noise for MCU and sensors)
3. Telemetry & Monitoring
• High-side voltage + current measurement on each channel
• INA219 or equivalent
• 4 × DS18B20 wall temperature sensors
• 1 × SHT31-D ambient temperature + humidity
• Optional: Local OLED status display
4. Data Logging & Communication
Primary controller: Particle Photon (or Photon 2)
• Wi-Fi upload to web platform / API
• OTA firmware update capability
• I²C and GPIO interfaces to measurement and drive circuitry
5. Voltage Waveform Requirement
Required drive waveform to electrodes:
• Alternating positive and negative voltage pulses
→ approx. +30V and −30V
• Zero-voltage rest phase between switching states
• Voltage overshoot must remain within ±35V
Waveform reference (oscilloscope):
(EOP unit output waveform recorded at McAlester AAP, November 1996)
6. Deliverables Required
• Complete Schematic (PDF + source)
• PCB layout ready for JLCPCB Assembly
→ Gerber, BOM, Pick-&-Place
• Component selection w/ manufacturer part numbers
• Mechanical drawing / connector map
• Brief firmware interface description (I²C commands etc.)
7. Additional Notes
• System must run continuously 24/7 for long-term concrete drying
• Future expansion: scalable to 12–16 channels
• Must be serviceable in field (replaceable channel modules preferred)
Electro-Osmotic Drying System – Electronics Specification
Client: Frode Evje – Norway
Project Scope
Electro-Osmotic Pulse (EOP) concrete drying system for moisture control in underground walls and foundations.
Design required for:
8 electro-osmotic channels
Current regulation
Polarity reversal
Full telemetry and cloud logging via Particle Photon
1. Functional Requirements
• Independent constant-current output per channel (8 channels)
• Adjustable drive current: 100–300 mA per channel
• Voltage output compliance: up to 24–30 VDC
• MOSFET H-bridge per channel (3–5 A rating)
• Automatic polarity reversal every 60–120 min
• Dead-time between polarity states: 2–5 seconds
• Integrated surge protection: TVS + RC snubber
• Per-channel resettable PTC fuse
• Per-channel status LED (active / fault)
image.png
2. Power Architecture
• Power supplied from external certified DIN PSU (230VAC→24VDC)
• No mains voltage on PCB
• On-board DC regulation:
• 24V → 5V buck converter
• 5V → 3.3V LDO (low noise for MCU and sensors)
3. Telemetry & Monitoring
• High-side voltage + current measurement on each channel
• INA219 or equivalent
• 4 × DS18B20 wall temperature sensors
• 1 × SHT31-D ambient temperature + humidity
• Optional: Local OLED status display
4. Data Logging & Communication
Primary controller: Particle Photon (or Photon 2)
• Wi-Fi upload to web platform / API
• OTA firmware update capability
• I²C and GPIO interfaces to measurement and drive circuitry
5. Voltage Waveform Requirement
Required drive waveform to electrodes:
• Alternating positive and negative voltage pulses
→ approx. +30V and −30V
• Zero-voltage rest phase between switching states
• Voltage overshoot must remain within ±35V
Waveform reference (oscilloscope):
(EOP unit output waveform recorded at McAlester AAP, November 1996)
6. Deliverables Required
• Complete Schematic (PDF + source)
• PCB layout ready for JLCPCB Assembly
→ Gerber, BOM, Pick-&-Place
• Component selection w/ manufacturer part numbers
• Mechanical drawing / connector map
• Brief firmware interface description (I²C commands etc.)
7. Additional Notes
• System must run continuously 24/7 for long-term concrete drying
• Future expansion: scalable to 12–16 channels
• Must be serviceable in field (replaceable channel modules preferred)