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Which BLE kits for wireless mock up of existing temp probe and display?

Other Parts Discussed in Thread: CC2541, ADS1224

 I am trying to show proof of concept wirelessly and can fly-wire multiple kits together to the existing wired temperature probe and monitor. Since the temperature probe will be on the body, any dev kit connected to the temp probe will likely have to be smaller in size. The temp probe will be wired powered by coin cell battery.

For the existing 'wired' version, the temp probe has 2 thermistors with 2 analog voltages(TH1 and TH2) going wired to the display. On the display side, analog TH1 and TH2 get fed into a TI ADS1224 ADC.

For the wireless mock up, on the temp probe, the signal would be 2 analog (TH1 and TH2). Then BLE Over the Air Transmit to the display side. (To modulate TH1 and TH2, this would have to get fed into the CC2540 12 bit ADC peripheral, correct?)

How about the connection on the display - BLE receiver side? On the display side, since it will sit on a desk, size can be larger. Also, a parallel option we may look into is to use a tablet/smartphone to display the temperature (BLE receiver side).

Looks like the options are CC2541 Mini DK(USB Dongle, KeyFob, CC Debugger), CC2541 Sensor Tag Dev Kit, CC2540 DK (CC254X EM, SmartRF Platform, USB Dongle), CC2540EMK-USB.

Would these kits work?
1) Dev kit to be wired with monitor: CC2540EMK-USB          Dev kit to be wired with temp probe: CC2540EMK-USB
Or do the other dev kits such as CC2541 Mini DK or CC2540 DK with the other pieces match up better? Could the CC2541 Sensor Tag Dev kit be used with the temp probe?

Attached is a crude diagram.0753.Temp sketch.pdf

  • Hi Andy, 

    I would recommend that you use the CC2541 MiniDK for both. It comes with a programmer, has a good number of break-out pins and basic auxillary functionality like buttons and LED. 

    If you need the high resolution, I would continue to use the ADS1224 and implement a SPI interface to that from the CC2541. 

    The easy part is of course that the temperature profile is already impemented as an example in the Projects\ble\Thermometer folder in the stack release. 

    Peder