From the Lab ...

... Hacking and Slashing since 2002

Saw this at some big chain store recently, so I decided to buy one ($39) and tear into it. Uses a TI CC2541 based BLE module from ILOGICTECH ...and they may or may not have written the App (Perfect App in the iTunes App store) that goes with this accessory. Not the sleekest design, nor the best app, but for 40 bucks, it's okay. Assembly of the unit and build quality of the board is average. 
 
Not pictured was the small 9 conductor ribbon cable between the main board and the LCD board. This unit also has a small E2PROM for 14 days worth of data storage, and a small 3 axis accelerometer (part making BOM7A ... looks to be I2C comms). 
 
Front (with small backlit LCD.) 
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One side ... 
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The other side ... 
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Inside ... 
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Since I published the Nordic Smart Beacon, I thought I'd show off what we've been playing with for the past 9 months or so. We've used this same design to do various types of demo sensors. The unit pictured is of a Sensiron SHT21 humidity sensor interfaced to the nRF51822. 
 
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Purchased these a few weeks ago, and have been toying with them. Nice. 
 
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Finally found a nice, gently used, RF current probe. FCC makes some of the best kit out there, and I'm happy to have found this unit for a very reasonable price. Covers DC to 1GHz. 
 
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We've been doing a lot of hacking around with BLE lately, so I thought I'd start publishing some of it. Sorry in advance about the scarcity of details. 
 
Recently we took apart a Belkin Conserve Insight energy monitor (model # F7C005) and determined that the unit used a simple SPI interface to an Analog Device's ADE7753 Metering IC. After sniffing the SPI comms of the original unit, it was pretty easy to tweak some BLE code we had lying around, and get it working with a Nordic EVK. The only real trick was interfacing the power ... the small (ugly) board in the upper right is a small 5V to 3V LDO, which is used to power the EVK. NOTE that we can not (nor should you try) to interface this set up to a computer for debugging. The 5V power supply in the main housing is non-isolated! 
 
The comparative wattage results from our setup to another F7C005 and a Kill-A-Watt were within 1 - 2W over a 1KW range. 
 
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Image of the cable termination (SPI+Power) on the PCB. 
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Pinout. 
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The unit does a little level shifting (the ADE7753 is a 5V part, and the uC in the display unit is 3V). 
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