Lo-tech PDT RollerTec Interface

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The Lo-tech PDT RollerTec Interface set enables a RaspberryPi to monitor and operate the PDT RollerTec garage door controller. A HomeBridge plugin is also provided - this set brings 'Hey Siri!' to this popular garage door system.

The set consists of a small status interface (daughter board) for RollerTec PCB, and a RaspberryPi HAT style board that provides opto-isolated connectivity between the RollerTec and the RaspberryPi, as well as providing a couple of power supply options and a temperature sensor.

Door Status Interface

This small PCB follows the physical format on the PDT Remote Door Interface board (no longer available) and uses a 74HCT32 to drive the status signals to the RaspberryPi board.

Parts List

Mouser Parts Lists:

Part Value Device Package Qty Mouser
C1 0.1uF (100nF) Ceramic Capacitor Through-hole 1 594-K104K15X7RF53K2
HD1, HD2 - Header socket, 1x3 Through-hole 2 200-CES10301TS
HD3 3-way screw terminal (3.81mm) FCI 220327-D031B01LF or
Kobiconn 158-P02EK381V3-E or
Multicomp MC000019
Through-hole 1 158-P02EK381V3-E
IC1 - SN74HCT32D SOIC-14 1 595-SN74HCT32D

RaspberryPi Inferface

The Lo-tech PDT RollerTec RaspberryPi Interface board connects directly to the RaspberryPi 40-pin header and is based on the Lo-tech RaspberryPi GPIO Board. For this application, the board provides two opto-isolated inputs, sold-state relay outputs, DS18B20 temperature sensor, and optional DC-DC power supply (accepts 8-30V).

The board enables the Raspberry Pi to issue door commands (open and close) and monitor the door status by interpreting the PDT Rollertec status LED. This in turn enables automation, for example using HomeBridge to interface the door to Apple HomeKit, so enabling voice control of the door. A HomeBridge plugin (see links below) is provided offering this functionality.

Parts List

Mouser Parts Lists:

Part Value Device Package Qty Mouser
C1,C2,C3,C4 0.1uF (100nF) Ceramic Capacitor Through-hole 1 594-K104K15X7RF53K2
C5,C6 10uF Electrolytic Capacitor E2-5 Through-hole 2 647-UVR1C100MDD
DC1 Non-Isolated DC/DC Converters Non-Isolated DC/DC Converters CONV DC/DC 1A 8-42VIN 5.0VOUT R-78C5.0-1.0 Through-hole 1 919-R-78C5.0-1.0
DS1820 Maxim Integrated DS18B20 Temperature Sensor DS18B20 Through-hole 1 700-DS18B20+
HD1, HD2, HD3 3-way screw terminal (3.81mm) FCI 220327-D031B01LF or
Kobiconn 158-P02EK381V3-E or
Multicomp MC000019
Through-hole 1 158-P02EK381V3-E
F1 LITTELFUSE 30R135UU. POLYFUSE, PTC, 30V, RADIAL, 900MA 30R090UU Through-hole 1 576-30R135UU
IC1, IC2 H11L1M Optocoupler, Schmitt Trigger H11L1M DIP-6 2 512-H11L1M
IC3 AQW282EH Solid State Relay - PCB Mount 60v 500mA DIP Form A Norm-Open AQW282EH DIP-8 1 769-AQW282EH
LED 3mm LED - Through-hole 1 645-521-9432F (red)
859-LTL-2231AT (green)
P1 SOCKET, PCB, 0.1", 20+20WAY - Through-hole 1 855-M20-7832046
R1 270R 125mW Carbon Film Resistor Through-hole 1 299-270-RC or
660-CFS1/4CT52R271G
R2 4k7 125mW Carbon Film Resistor Through-hole 1 279-CFR16J4K7
R3, R4 1k 125mW Carbon Film Resistor THT 1 299-1K-RC
RN1 560R Isolated SIL-8 Resistor Network (Bournes 4608X-102 type) THT 1 652-4608X-2LF-560
DIL Socket, 8-pin - SOCKET, VERTICAL, 1ROW, 8WAY SIL8 1 571-215297-8 or
571-829265-8
IC Socket (DIP8) - - DIL8 1 571-1-2199298-2 or 649-DILB8P223TLF
IC Socket (DIP6) - - DIL6 2 571-1-2199298-1

Example Implementation

The picture, right, shows the interface kit fitted to the PDT Rollertec controller PCB mounted in an electricians style universal ABS plastic case. Push-button control can be retained by connecting both the RaspberryPi and push-to-make buttons to the respective terminals T13-15. A physical stop button should also be provided.


Resources

See Also