Monday, July 27, 2009

Over the weekend... RFM12B-USB Interface & CNC Work...

Had some spare time over the weekend so I decided to move on on my wireless data logger project. The slave/master communication was ironed out earlier. At least I know that data are being transmitted and received correctly because the checksum is valid. I had no way of knowing what actual data was transmitted because I had no visibility on the communication.

So, I decided to make a small RFM12B-to-USB interface as shown below. With this unit, I should be able to sniff the communication over the air and display the capture information on a PC. Yet to do some codings for it though, for the PIC and the PC. Not only the interface allows me to sniff the traffic, I can actually make it behave either as slave or master. That will be helpful in testing the configuration and logging protocol later on.


I also spend few minutes on my Sherline CNC to mill out some holes for a friend. He wanted to mount the digital volt and ammeter to the casing... so my CNC was summoned to the rescue... In photo below, the meters have not been flush mounted to the casing... once flushed mounted, it's gonna be pain in the *&^ trying to take it out because of the very tight fit...

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