Very, very compact (13 x 8.8mm on 0.7mm pcb) light module that can be used in modeling etc…….
The module has output for 2 channels, a build in bec so it can operate from an wide range of power supply and independent supply for the leds.
It has vary preprogrammed light sequence, for now there are 8 programs. Most of them are maybe typical dutch. Watch the video to see them all.
If you are interested in a module or in a module with other sequence mail me.
This device will transmit some parameters wireless from my Rc-nitro car to a hand held PDA.These parameters are; Motor RPM, Speed KmH, Fuel level, Battery voltage, Engine temperature and 3-axis G-force.
First we need to design some sensors. For the RPM and KMH we are going to use a reflection sensor . Due the high RPM it was not possible to mount a magnet to the motor or drive shaft. The reflection sensor will give a pulse when the reflection goes from light to dark or dark to light. The sensor is only available in smd package, so we need first to design a carriage board. Testing the board was done in a drill and the sensor was working very well up to 1,5mm from the drill shaft.
Next sensor needed is the fuel level sensor, just 2 M2 bolds to measure the resistance of the fuel. How higher the level is more of the bold makes contact with the fuel, how lower the resistance. I’m not sure of this sensor will work in the real world, reading is very unstable due the sloshing of the fuel. Did also some experiments with capacitive measuring, but ill try this first.
Now we go testing the wireless connection. First I want to use the cheap 433Mhz transmitters, this was working good with some manchester coding and crc. The problem that I noticed was that the 433Mhz was full of other “things”, for instants i know now that my neighbors has a logitech wireless mouse. Then I tried Bluetooth, that was also working very well, but i want my application running on a PDA and there was no bluetooth classe 1 CF card on the market. Bluetooth was also not cheap and compact. Then I run in the Nordic nRF24L01 2.4Ghz transceiver. It was compact, cheap and smart. Please read my application note fore more details. The Nordic will do retransmit, crc, ack , etc… by itself and fast. I hope that 100 meter range will be enough.
First schematic was running on 5V, but the nRF24L01 and the MMA7260 (1.5g – 6g Three Axis Low-g Micromachined Accelerometer) sensor requires 3,3V, so decided to make everything running on 3,3V.
Schematic is finished and pcb is designed and made.
Soldering the MMA7260 was not that easy. Notice the 6x6mm Qfn16EP package in the upper left corner, very difficult to solder because there are no leads.With some solder paste, heating gun, patience and 3 retry s it’s done and working.
This is my HPI Savage x4.6 with Dodge charger ’69 body painted in the well known Dukes of hazzard colors. To make this model realistic i want old fashion American taillights that are controlled with the remote controller of the car.
Designed on request, rc nitro car ignition killer.Will kill the ignition of a rc-nitro car by hand trough the 3e rc-channel or if the voltage drops below a programmed voltage. Schema / source / handleiding etc (rev.1)
-Schematic and pcb designed with Eagle 4.15
-Software created with Bascom-avr
Revison 2: Some receivers are working on an higher voltage then the default 5V. The BEC systems are direct connected to the battery so the voltage can rise up to 7V. Added very low drop 5V voltage regulator and extra resistor in the servo in line to limit the zener current.
This device will light up LED’s if the car is breaking, monitor the reception and quality of the received signal from the transmitter and the battery strength. With setpoint learning function.
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