hi guys

i have been wanting to build this tool for sometime but had problems in getting parts locally (waited for 3 years and the guys started stocking the micro controller n other required parts) yesterday i finally got all the components

Multi-Tester V4.35 Spec:

Tachometer :

    * Non-contact Digital Photo Tachometer
    * Period measure method
    * 5 digit LCD Display.
    * 60 to  65535 RPM, auto range, resolution up to 1 RPM
    * Support 1 to 5 blades propeller
    * Accuracy +- < 0.2%
    * Refresh rate 0.3 ~ 0.6 second
    * Air speed calculation for 2.0 to 9.5 inch Pitch, 0.5 Inch / Step
    * Optional Ext. propeller for wind speed measure


Servo tester: Resolution 10 uS / step, 20mS / frame

6 test modes:

        1. Manual mode
        The PWM pulse width range from 1000uS~ 2000uS, 10uS/step with one touch neutral point (1500uS).

        2 Knob
        Analog knob input, around 850uS ~ 2150uS

        3. Fast mode
        Jump between 1000 and 2000 every 0.5 second, auto process 5 times

        4. Middle mode
        2 second from side to side, auto process 5 times

        5. Slow mode
        10 second from side to side, auto process 2 times

        6. Random mode
        Random Jump every 0.3 second, auto process 20~30 times


Speed controller tester:

2 test modes:

        1. Manual mode
        The PWM pulse width range from 1000uS~ 2000uS, 10uS/step with one-touch stop point (1000uS).

        2 Knob
        Analog knob input, around 850uS ~ 2150uS,  depend 

Receiver tester:

Measure Range  0.80mS ~ 2.20mS PWM

Voltmeter:

DC 0~20.0V / resolution 0.1V

for more information please visit the site [ link at bottom ] time to start building, will post pictures later

sahil

http://www.geocities.com/ilufa/MT_E.htm

okay, this time i decided to build the circuit slightly different by breaking up the circuit into small island and connecting all of them on to the main board........some thing like on a mother board 

first up is the tachometer section (finished, see pictures)

part two, the 1st picture is of the remaining part containing servo tester, ESC tester, voltmeter n receiver tester! and some more pictures of how it might all look like   

Sahil,

Good to see you start another project. Wish it comes along nice and perferct. BTW, an electronics enthusiast of your caliber should not wait for kits and spares to be available. I would expect you to design it yourself...

Also, you are already due on the TX and RX project that you started sometime earlier.. 

-Ismail

QuoteAlso, you are already due on the TX and RX project that you started sometime earlier..   

yes, karma has donated a radio but that thing got damaged in transit (one joystick broken long with a pot  ) but was able to repair the joystick back and could not do anything about the pots as the value 5K was not available anywhere or that type pot, after long searching i was able to find 10k pot of that type but shaft is long and have to modify and cut a grove to fit the joystick assemble.................

BTW, can you help me on the RF front ?? lots of pending work to do ! also the unit I'm building was mainly to help calibrate and fine tune my code-receiver tester !

the rf section i got long with the radio is an FM 35mhz but the crystal was lost already,so only way i can even get it working is it i have one tx crystal on that band and a Frequency counter which is an another build/ calibration section  lots of work..........its like having to buy a horse because i own a pair of horse shoe  but this is the path i choose and will stick with it no matter what time or effort it take 

sahil

QuoteGood to see you start another project. Wish it comes along nice and perferct. BTW, an electronics enthusiast of your caliber should not wait for kits and spares to be available. I would expect you to design it yourself... 

Sahil,

I could help you better if I were in India. Now, I could hardly find time. However, I would be happy to contribute in whatever way possible. Why not get a 35MHz crystal and get the thing finished?

Or you can get an 2.4GHz ASSAN Hack module for $60. Use this module for this project. Once you are satisfied with the project you can migrate the hack module to your existing radio, so that you can transmit either in 2.4GHz or 72MHz at the flip of a switch.

http://www.rcindia.org/radios-and-receivers/2-4ghz-or-723540mhz-(ppm)-diy-frequency-selectable-transmtter/

Just my thoughts...

-Ismail

hi izmile

sorry been busy just got back, naaa 60$ for a module no way but i'm getting some hitec 72mhz band fixed frequency modules for 9.99us$ brand new in a deal so will be buying some 3 or 4 these !

the multi tester is almost done, just need to connect the power wires and program the chip !

Quoteso that you can transmit either in 2.4GHz or 72MHz at the flip of a switch.

i would definitely like to try this out but may be some time later

sahil

yeaaaaa finally finished the multi tester, wow what a device will post detailed videos of each option and sub options   

some more closeup shots 

two more n that's it, time for some videos 

Looks cool!... Now all you need is to put it inside a nice plastic casing.

video of Digital servo tester with sub menu option for

1. manual control by start and stop switch's in increment/decrement of 10us with select switch as auto centering option.
2. know control mode in which the a pot is rotated to control servo, with select switch of toggling BTW pot value and center.
3. servo fast test mode, 1.5ms-1ms-2ms-1ms-2ms-1ms-2ms-1.5ms
4. same as fast mode but at medium speed
5. same as fast mode but slow speed
6. servo random option.......generate signals at random intervals like 1ms-1.75ms-2.2ms-1.22ms etc.
7. ESC control option
press stop to return to the main menu.

there is same challenge in this build, the voltmeter option is left to the end user to figure out and i found that option 

video shows how to enter voltmeter mode 

http://www.youtube.com/watch?v=8i_shpzex8o&feature=channel

QuoteLooks cool!... Now all you need is to put it inside a nice plastic casing.

thanks izmile , will do that some time later  .................my more urgent need is to build an
brushed ESC with Lipo cut off  will post a built log later.

regards

sahil

sorry i forgot to mention the cost of this project  , a total of 300 rupees is what i paid for this project this include all the component from micro controller IC,LCD display to PCB,solder wire! plus time spend in building it = lots of fun and a handy tool for me 

if any one is thinking of building it who has some experience in electronics but don't have access to the micro controller from your local store or don't know how to program the chip or don't have a programmer, ask me i might be of help 

bye

sahil

That is awesome   

A friend has a Bantam eStation Heli Master, and they cost like like $110 or more.

Fantastic build , Look forward to ESC with LIPO auto cut off

thanks guys, sai the ESC I'm building right now is set to 2s lipo at a cut off voltage of 3.35v per cell but can be changed to adapt number of cells!

sahil

update, here is a better quality video showing all the options present and please don't pay attention to the audio 

Now we can really see the beauty of this baby in action 

I just wish you had not placed the push switches directly behind/under those erect components/wires.

Hello Sahilkit,
How do you calibrate the instrument in its various modes.
---Rao.

QuoteI just wish you had not placed the push switches directly behind/under those erect components/wires.

yes i could have done something about it but i don't have any problems reaching the switches, it might look the other way in the video 

QuoteHow do you calibrate the instrument in its various modes.

tachometer can be compared with a ready made model and see the error !

but digital servo tester,ESC tester,receiver tester n voltmeter have been checked with CRO or scope

sahil

Sahil,
after testing and comparing with a commercial digital tachometer how do you correct the error? In the other modes what is the procedure to check with a CRO and calibrate the instrument so that actual readings show up by the instrument?
---Rao.