Huntercad470

the comparison between the two relay boards may be a bit unfair, because the Phidgets offering is a series of sensors, motors, relays, displays and other stuff which are all handled by the same sophisticated driver library, whereas the KMTronic relay is just a relay operated via a USB connection and a virtual COM port. Phidgets devices come with a wealth of example software supporting all programming languages you can think of. On the other side, the KMTronics use case is so simple it does not even need a lot of example code, although it can be found on their web site.

KMTronic USB One Relay

Standard Microsystems Corporation

Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. Bus 001 Device 004: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n The line in green shows that raspberry recognized an usb wifi module. Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from an external SMBus Host. Port power switching on an individual or ganged basis. Port over-current monitoring on an individual or ganged basis. Compound device support (port is permanently hardwired to a downstream USB peripheral device).

A KMTronic USB relay attached to a Raspberry Pi is really simple to use. On Raspbian the FTDI Driver is already included, so the relay just needs to be plugged into a free USB port.

will find the device:

Switching the relay on, assuming it can be accessed as /dev/ttyUSB0 using bash:

Switching it off works accordingly:

Switching the relay with Python, using 1 for “on” and 0 for “off” in the command line: Download u-blox modems driver.

the second byte in the string sent to the device represents the channel. For boards with more than one relay, this channel addresses the relay to be switched.

As no drivers or whatsoever need to be installed, it took me less than 30 minutes from plugging in the device until it worked reliably, controlled by a python script .

I just noticed the more recent boards allow to read out the status of the relay(s) by sending 0xFF 0x01 0x03. The board will respond with the status of the relay.

Phidgets InterfaceKit 0/0/4

The interface kit 0/0/4 exhibits 4 relays. In order to operate a Phidgets Interface Kit we need to install a couple of drivers:

• lsusb-1.0-0-dev
• Download and install Phidgets libraries
• Download and install Phodgets Python Module
• copy Python examples to Raspberry Pi and try out.

I followed these instructions. The same can be found at instructables.com. Although the instructions are crystal clear the whole procedure took me about 2 hours until I succeeded to discover my interface kit 0/0/4. Especially compiling the libraries took quite some time.

However, the interface kit immediately resets when the relays are activated by a command. This happens with all power supplies that I have tried. I connected a 5V/4A power supply that I have been using for years reliably with Raspberry Pis with the same result. Therefore I tried a external active USB hub as it is recommended by Phidgets. After I found a hub that is compatible to the Raspberry Pi (Kensington Pockethub Mini USB 2.0) and that does not backpower the Raspberry, I had the same result.

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It seems that the switching of the relays causes transients on the board itself that lead the board to detach and attach again, like i would unplug the USB cable and plug back in. I will give it possibly a last try with a big buffer capacitor mounted on the board. Not straight forward, actually. Or are the boards defective? I have 3 of them, all operate in the same manner.

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