DPDT Relay Relay Boards with DPDT Relays Installed Double Pole Double Throw Relay A DPDT Relay, Double Pole Double Throw Relay, has a single coil with two arms that move at the same time.  There are two completely separate SPDT switch mechanisms inside a DPDT relay.  A DPDT relay board is most commonly used for signal switching applications, but can be found in high power switching applications as well. Shop DPDT By Interface Bluetooth DPDT Wireless  - Cell phone control with ProMote Software Ethernet DPDT Boards  - DPDT Boards with Ethernet Interface RS232 DPDT Boards   - DPDT Boards with RS232 Interface USB DPDT Boards   - DPDT Boards with USB Interface WiFi 802.11b DPDT Wireless   - Control from anywhere on the network IEEE 802.15.4 DPDT Wireless   - Low cost 2-way communications DPDT XR Expansion Boards   - Add DPDT Relays to any ProXR Board Shop DPDT By Channel 2 Channel DPDT Relay Boards 4 Channel DPDT Relay Boards 8 Channel DPDT Relay Boards 16 Channel DPDT Relay Boards 24 Channel DPDT Relay Boards 32 Channel DPDT Relay Boards Data Collection and Control with Future Expandability in Mind. This ProXR Series Controller is Feature Rich and Ready to Grow with your Needs! Summary of DPDT Relays Low-Cost 8-Channel FET Configuration 1200/2400/9600/19.2K Baud Operation Control 256 Levels for Each FET Programmable Power-Up Level Programmable Power-up Memory Two-Way Communication Capabilities Quick Connect Terminal Blocks 2 RS-232 Input Levels DPDT Relay Our DPDT boards offer your choice of 1, 3 or 5 amp relays and are available with your choice of eight channel 8/10-Bit Analog to Digital Conversion or UXP Expansion Port on selected models, look for AD or UXP in the part number. All are of course SignalSwitch compatible.  Select Wireless Relays feature the ProXR Command Set and an XR Expansion Port, simply look for PROXR in the part number.  The XR Expansion Port will allow you to expand any ProXR model board to 256 relays using our XR Expansion Modules.  The UXP port will allow you to add Analog to Digital Expansion Modules, Contact Closure Input Modules or Digital Potentiometers to any UXP board. Articles New to Computer Controlled Relay? Click the following links for helpful wireless articles to get you started.   Bluetooth Communications - Introduction Ethernet & Wi-Fi, 802.11b Communications Fiber Optic Communications RS-232 Serial Communication - Introduction USB Communications - Introduction Wi-Fi, 802.11b & Ethernet Communications ZB ZigBee Mesh Networking - Introduction ZigBee Communications - Introduction 802.15.4 Wireless Communications Introduction to Computer Control A/D Conversion Wireless Analog to Digital Converter UXP Expansion UXP Expansion Port XR Expansion ProXR versions Onboard analog to digital conversion is available on selected models of these controllers! This will allow you to: Read light and temperature levels Easily activate relays when A/D limits are reached Detect audio levels in a room when connected to a microphone Read switches, potentiometers, and analog joysticks applications are limitless, and surprisingly easy to integrate Available on select boards More Information > UXP is a new standardized data port, specifically for the purpose of speaking to various expansion modules. If the controller you are considering is equipped with a UXP port, you can take advantage of extended commands to speak to our growing line of I/O expansion modules. UXP in the part number allows you to: Add Contact Closure Inputs Add Analog to Digital Inputs Add Voltage Detectors Digital Potentiometer Outputs Available on select boards More Information > Models with the ProXR suffix will feature the ProXR commend set. The ProXR series will allow you to: Send simple commands to activate relays Upgrade without having to re-write your software Activate up to 16 relay timers Control up to 256 total relays using the XR expansion port Full backward/forward compatibility w/the ProXR series command set Available on all boards More Information > NCD Component Library Download NCD Component Library By downloading the NCD Component Library you will receive over 40 samples from A/D Conversion to Duration and Pulse Timing and best of all it's FREE!! We want the user to be able to experiment with all the different samples available so as of right now the samples cannot be downloaded individually.  We've "Started" the Programming for You With the NCD Component Library we've "started" the programming for you.  We say started because these are fully functioning samples but we've also included the source code so you can customize them to your exact needs.  Start by downloading the NCDComponentSetup.zip file from the NCD Component page. Download NCD Component Library  Over 40 samples included with this download!  To view screen shots of each example visit our NCD Component Library Page. DPDT Relay Controllers Code Name Image Price   R21DPDT 2-Channel 1-Amp DPDT Small Signal Relay Board $59.00 R23DPDT 2-Channel 3-Amp DPDT Signal Relay Board $64.00 R25DPDT 2-Channel 5-Amp DPDT High-Current Signal Relay Board $69.00 R41DPDT 4-Channel 1-Amp DPDT Small Signal Relay Board $89.00 R43DPDT 4-Channel 3-Amp DPDT Relay Board $99.00 R45DPDT 4-Channel 5-Amp DPDT Relay Board $109.00 R81DPDT 8-Channel 1-Amp DPDT Relay Board $119.00 R83DPDT 8-Channel 3-Amp DPDT Relay Board $139.00 R85DPDT 8-Channel 5-Amp DPDT Relay Board $159.00 R161DPDTPROXR 16-Channel 1A DPDT RS-232 Relay Board with XR Expansion Port $262.00 R163DPDTPROXR 16-Channel 3A DPDT RS-232 Relay Board with XR Expansion Port $302.00 R165DPDTPROXR 16-Channel 5A DPDT RS-232 Relay Board with XR Expansion Port $342.00 R241DPDTPROXR 24-Channel 1A DPDT RS-232 Relay Board with XR Expansion Port $393.00 R243DPDTPROXR 24-Channel 3A DPDT RS-232 Relay Board with XR Expansion Port $453.00 R245DPDTPROXR 24-Channel 5A DPDT RS-232 Relay Board with XR Expansion Port $513.00 R321DPDTPROXR 32-Channel 1A DPDT RS-232 Relay Board with XR Expansion Port $524.00 R323DPDTPROXR 32-Channel 3A DPDT RS-232 Relay Board with XR Expansion Port $604.00 R325DPDTPROXR 32-Channel 5A DPDT RS-232 Relay Board with XR Expansion Port $684.00