USB Relay Module and USB Relay Controller

USB IO Modules are designed and developed to facilitate control / monitoring of digital as well as analog signals.

The USB Relay Module is compatible with computers running OS like Beaglebone, Raspberry Pi, Linux and Windows. Python API and Java API along with command line tools are provided for easy integration with users.

USB Relay Controller

The USB Relay Module DO4-S can control 4 SPDT relays on application of voltage to the coil. The USB relay can be configured in three modes such as SPDT Relay, Open Collector and Solid State Relay. Engineers need to select a suitable configuration at the ordering stage itself based on the application needs.

In the solid state relay configuration, SSRs (solid state relays) are employed for realizing potential free contacts or optically isolated contacts. Each of the output can withstand current up to 0.75A at voltage levels of 30V. It finds wide usage in applications like controlling power loads such as heating elements, pumps and lamps through periodical pulsing or statistical switching. It has capability for switching loads up to 22.5W.

In SPDT Relay mode, it allows toggling or switching signals to facilitate measurement without any distortion. It is useful in applications that demand pure signal outputs.

In open collector mode, transistors are employed for faster transitions in digital output signals to dim LED lights. The module can switch loads up to 22.5W. Its rated outputs are 0.75A and 30V.

USB Relay Controller

Solid state relays employ PWM technique for faster transitions to control power loads like pumps and lamps. SSRs provide protection to user systems like computers.

PWM ensures flicker free dimming of lamps and LEDs in open collector mode. Open collector outputs offer less protection to the host computer.

The USB Relay modules are designed and developed to use mechanical SPDT (single pole double throw) switches. Therefore, in this USB module switching is realized through mechanical SPDTs. It is suitable for controlling applications like fans, valves and lamps. The mechanical SPDT relay based USB module also controls audio signals and temperature sensors without any distortion.

Mechanical relay output provides excellent protection to the computer. SPDT switches facilitate ON /OFF transition of signals apart from allowing selecting either ON or OFF signals. Engineers can connect one loud speaker to NO, another to NC lines and the audio source to C of the relay in audio applications. In the long run, the number of cycles limits the life of the USB relay module.

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