Very cooool! I like the "tong" at 1:40

best regards
Andreas

it was the noise from the door hit. lol

I switched from L293D http://www.ti.com/lit/ds/symlink/l293d.pdf

to SN754410 http://www.ti.com/lit/ds/symlink/sn754410.pdf

cause it was getting a little hot.

Great Job almamater....

https://www.youtube.com/watch?v=YgTa__CPP9U

Its an old RF R/C toy car that i convert it to Bluetooth R/C controled from a smartphone with an aplication that i made with MIT App Inventor. For the movements i use the smartphone's internal orientation sensor and some buttons to turn on/off the lights, to activate the horn, to change "gears" and to connect to bluetooth module of the car.

For the car i removed all the electronics exept the motors and i installed 6 new AA 1,2V rechargable NiMh 1900mAh batteries. I designed new electronics based on Arduino with a HC-05 Bluetooth module and two h-bridge ic's. The L293D for steering motor and the L298N for forward/backward motor. For both ic's i connected parallel the channels, 1 with 4 and 2 with 3.

I will try to upload soon some schematics and code.

Thank you
Kostas Kokoras

Sorry for not replying for long time...had some laptop problems.

almamater you are doing great as i can see, and thnx aestrada for the very detailed explanation of HC-05 bluetooth module functions.

Hello, in your code you have setupBlueToothConnection where you put the AT commands, it is necessary run this code every time that we start the circuit? The last changes\configurations are not saved on the bluetooth module memory if we dont use the 'Reset' command?

P.S.: How you found the address of your Elm327? for example, if i have this: "00:02:03:ac:a1:d3"..

Well i run this function every time, although it doesnt needed except first time, just in case, simply.

I think that finally i got the code completed.
It is working with great accurancy.

But because i am not pro, be free to suggest any improvement or ask for some explanations.

http://www.kokoras.com/OBD/Arduino_HC-05_ELM327_OBD_RPM_Shift_Light.htm

https://www.youtube.com/watch?v=MeUgWF98Ndw

It 's about an Arduino project connected to an ELM-327 OBDII Bluetooth through a HC-05 bluetooth module.
The HC-05 is connected to Arduino with serial UART, and is configured (with AT commands) as Master to connect to ELM-327 OBDII Bluetooth which is the slave.
As soon as connection established begins the initialitation (with AT commands) of ELM-327.
After that we can read Engine RPM from car's ECU.
Next just display the RPM to 7-segment LEDS.
Shift Lights going ON at the RPM that we configure pressing the button at desired  Engine RPM, value is stored to EEPROM.
Please feel free to comment or suggest or contact me.
Code needs some comments, i hope i can post soon, schematics will post as soon as possible.

Kostas

http://www.ebay.co.uk/itm/251208216925?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

http://www.amazon.co.uk/ELM327-Bluetooth-Wireless-OBD-II-Diagnostic/dp/B006JJZVQE/ref=cm_cr_pr_product_top

I just managed to upload all in my site

http://www.kokoras.com/solartracker/en/

i am really happy that at least one person is really interested in this project, hi april 

The schematics on video are.....

1. for the pontensiometers to the to axles for measuring the angles of tracker one for elevation 30-90 degrees and another for azimuth 120-240 degrees
www.kokoras.com/solartracker/Angle_Pontensiometer_SolarTracker_schem_kokoras.jpg
pontensiometers dont give me very acurate measurment but that was what i had in hand...encoders will do better job i suppose

2. a switch so i can choose between sun tracking mode and manual mode
www.kokoras.com/solartracker/Auto-Manual_switch_SolarTracker_schem_kokoras.jpg

3. four buttons that move the tracker in all diractions when in manual mode, pressing together the UP and East will enter calibration mode
www.kokoras.com/solartracker/Buttons_SolarTracker_schem_kokoras.jpg
in calibration mode moves automatically to the limit switches of all directions one by one and measure the value of pontensiometer and stores it to rtc memory.

4. DS1307 iic RTC and memory, maybe i should use capacitors on the crystal here, cause its loosing time
www.kokoras.com/solartracker/DS1307_schem_kokoras.jpg

5. just a led to idicate that one of limit switches is reached
www.kokoras.com/solartracker/Limit_Indicator_switch_SolarTracker_schem_kokoras.jpg

6. four limit switches of the four diractions of tracker, limit switches are mechanically adjustable so u can control the angle widths.
www.kokoras.com/solartracker/Limit_switches_SolarTracker_schem_kokoras.jpg

7. two motor control circuits h-bridge with relays, from here http://arduino-info.wikispaces.com/DC-Motors with the effect known as “fly wheel braking”. 
www.kokoras.com/solartracker/Motor%20Controll_SolarTracker_schem_kokoras.jpg

here are 3 different pics of electrincs as the project was procceeding
www.kokoras.com/solartracker/breadboard_solartracker_kokoras_1.jpg
www.kokoras.com/solartracker/breadboard_solartracker_kokoras_2.jpg
www.kokoras.com/solartracker/Breadboard_solartracker_kokoras_3.jpg

No i didnt use real panels cause i dont have one. the mechanical construction is done from an old fence that was removed. i bet it can hold one real panel for sure or maybe two. the piece of wood i put on has about the same weight of a real panel.the linear actuators are from hospital beds so the can support more than 100Kgr each. i suppose a mechanic must design a construction that is correct for the job it will do depenting of how many panels are gone placed on.

here is the arduino code, most of comments are in Greek language, sorry..
www.kokoras.com/solartracker/Arduinnocontrolledsolartracker.htm

here is the VB code
www.kokoras.com/solartracker/Solartracker_VB_code.txt


as for download a video from youtube i use jdownloader, just copy the link from youtube and the rest is easy.

And you need some guidance for what? Maybe posting in the correct place - Exhibition/Gallery.

Yes, you are absolutely right, i missed that ...
Maybe a mod can move it to correct place for me, pls?

https://www.youtube.com/watch?v=Txl-D2fID1g

It's an Arduino project controlling 2 linear actuators with 24v dc motors calculating the position of the sun on the sky using solar geometry http://www.pveducation.org/properties-of-sunlight/motion-of-sun
One motor for Elevation and the other for azimuth.
Schematics available in video.