I bought my first complete TX HK-T6A version 1 & RX HK-TR6A in the last year at Hobbyking e-shop. The package contained receiver with remote satellite device. The first idea, what came to my mind, was to use this remote receiver as standalone device, namely due to it’s dimensions.
RC 2.4GHz receiver
I have decided to realize the project called “MIKROKOPTER” since September 2009. I have to appreciate the effort of designers. It’s simply perfect project ! I can recommend it for everybody, who likes RC helicopters, wants to start with them or would like to take some photos / record video from the sky ….
I have published accumulator monitor (called LiXXX watchdog) one year ago. This design uses buzzer to signalize low voltage cell(s) of three cells LiPol / LiIon / LiFePo battery.
Now it’s the time for more sophisticated entrance. One possibility is using of JETI DUPLEX 2.4GHz system. It allows to transmitt data back to transmitter (TX module) and display them with JETIBOX. The idea to use this feature for monitoring state of battery cells is then obvious.
JETI DUPLEX battery monitor
Although I haven’t got any RC car, my friend ask me for programming of RC car lighting system. I produced the code for the PIC16F819 microcontroller from Microchip. Finally, it can have 4 PPM channels as input (I used 3) and 12 outputs (5 of them are used) able to drive 25mA per one output (max. 200mA in total).
RC car lighting system
There are many systems transmitting on 2.4GHz available at the moment. Some of them are able to transfer more than 8 channels typical for standard PPM modulation systems. One of example is made by the czech company “JETI model” http://www.jetimodel.cz/index.php?page=products&old=0&category=4 . Their system is capable to transfer up to 16 channels. It is opportunity to control more devices than model itself … camera, autonomous navigation. The only task is to merge signal from two RC transmitters with the result usable as input to the transmitter module (PPM signal too).
I solved this task with two microcontroller PIC18F252, called “MASTER” and “SLAVE”.
RC merger
