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Raspberry Pi and eZ430-RF2500 (MSP430)

I decided to attach a TI eZ430-RF2500 module to the Raspberry Pi.

Texas Instruments eZ430-RF2500 radio module

Fig. The eZ430-RF2500 module.

To do that I soldered a 2.54 mm pin header onto the battery board and connected those pins to the Raspberry Pi with wires.

eZ430-RF2500 battery board with a 2.54 mm pin header

Fig. The soldered pin header.

CAUTION! Make sure that jumper JP1 on the battery board is open or removed. I assume that the changes to /boot/cmdline.txt and /etc/inittab that free the port for our own use have been made, as described in the article about the UART port. Connect the eZ430-RF2500 module to the Raspberry Pi board according to the diagram.

Wiring diagram of the eZ430-RF2500 module and the Raspberry Pi P1 header

Fig. Wiring diagram of the eZ430-RF2500 and the Raspberry Pi.

After powering up the Raspberry Pi and logging in, we start the previously installed minicom program at 9600 bps with the command:

minicom -b 9600 -o -D /dev/ttyAMA0

Temperature readings from the attached module should appear on the screen.

Terminal showing temperature readings received from the eZ430-RF2500 module

Fig. Temperature readings from the eZ430-RF2500.

If we have more complete modules, each with its battery board, we can switch them on. A TI SimpliciTI(r) network is then formed.

Three complete eZ430-RF2500 modules with battery boards

Fig. Three complete eZ430-RF2500 modules.

Readings from several eZ430-RF2500 modules in the Raspberry Pi terminal

Fig. The terminal showing readings from several eZ430-RF2500 modules.

Sample readings from the modules in text form:

Node:0001,Temp: 73.7F,Battery:2.9V,Strength:044%,RE:no
Node:HUB0,Temp: 77.7F,Battery:3.2V,Strength:000%,RE:no
Node:0002,Temp: 75.0F,Battery:3.1V,Strength:052%,RE:no
Node:0003,Temp: 71.9F,Battery:3.0V,Strength:041%,RE:no
Node:HUB0,Temp: 77.7F,Battery:3.2V,Strength:000%,RE:no
Node:0001,Temp: 73.7F,Battery:2.9V,Strength:045%,RE:no
Node:0003,Temp: 71.2F,Battery:3.0V,Strength:039%,RE:no
Node:0002,Temp: 75.0F,Battery:3.1V,Strength:053%,RE:no
Node:HUB0,Temp: 78.4F,Battery:3.2V,Strength:000%,RE:no
Node:0001,Temp: 73.7F,Battery:2.9V,Strength:045%,RE:no
Node:0003,Temp: 71.2F,Battery:3.0V,Strength:039%,RE:no
Node:HUB0,Temp: 77.7F,Battery:3.2V,Strength:000%,RE:no
Node:0002,Temp: 74.3F,Battery:3.1V,Strength:052%,RE:no
Node:0001,Temp: 73.7F,Battery:2.9V,Strength:044%,RE:no
Node:HUB0,Temp: 78.4F,Battery:3.2V,Strength:000%,RE:no
Node:0003,Temp: 71.2F,Battery:3.0V,Strength:040%,RE:no
Node:0001,Temp: 73.7F,Battery:2.9V,Strength:045%,RE:no
Node:0002,Temp: 75.0F,Battery:3.1V,Strength:053%,RE:no
Node:HUB0,Temp: 77.7F,Battery:3.2V,Strength:000%,RE:no
Node:0003,Temp: 71.9F,Battery:3.0V,Strength:039%,RE:no
Node:0001,Temp: 73.7F,Battery:2.9V,Strength:044%,RE:no
Node:HUB0,Temp: 77.7F,Battery:3.2V,Strength:000%,RE:no

We can see the node number, the temperature at that point, the supply battery voltage, the radio signal strength and the operating state of the module. In a later part I will deal with interpreting these results using a purpose-written application.

Wireless transmission of sensor data is a typical task for a measurement system - we used a similar solution in our measuring probe. We build measurement data acquisition systems to order.


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