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DIY: 20 LED display Tachometer for Sniper 135

EinVer

EinVer

Super Veteran
para po sa mga mahilig mag DIY dyan with electricals/electronics
(dito ko po pinost sa Country Specific forum, ayaw ko kasi mag english hehe)

20 LED display Tachometer
technically speaking, analog display po sya, since huhulaan mo kung anong rpm ka na
but this is digitally driven, kaya hindi sya aagaw ng power from ignition coil gaya ng ginagawa ng mga analog tachometer na nabibili sa caloocan (e.g. type-r)

di bale 2 parts po ito, yung una LM2917 IC para sa pickup ng rpm signal from ignition coil/cdi, then output as voltage (frequency to voltage)
yung 2nd is cascaded LM3914 LED display driver to translate the voltage from LM2917 to LED display

kahit hindi nyo maintindihan yung info above, basta makuha nyo tong schematics, okay na :)

eto po schematics:
LM 2917


LM3914



in my case, 18 LEDs lang ginamit ko
yung 17th LED ko ay 3mm super bright white para madaling mapansin
this indicates my timing for a good shift
18th LED is 3mm super bright blue, mas agaw pansin to kesa white
mabilis lang kasi yung paglipat ng ilaw kapag humahataw ka, kaya ang dating nyan eh parang nag blink twice ng malakas yung tacho meaning time to shift up :)

adjustable po thru a variable resistor yung limit (yung malaking bilog na may arrow at 500k ohms rating sa LM2917 circuit)
para kahit naka after market CDI ka with no limit, pwede mo i-adjust para hindi ka mag over rev

pics:

bread board prototype ng LM2917


laying out the wires


under the panel


panel outcome (wala pang gear indicator)



Video results:
http://www.youtube.com/watch?v=PqvCdLXnKDc
[video width=425 height=344]http://www.youtube.com/v/PqvCdLXnKDc[/video]

http://www.youtube.com/watch?v=Yps4NjA4ofI
[video width=425 height=344]http://www.youtube.com/v/Yps4NjA4ofI[/video]


edit:
hindi po ako expert sa electricals/electronics
yung design ay kinuha ko lang sa datasheets ng LM2917 at LM3914
may iniba lang ng konti sa values at wirings para mag work sa Sniper 135
feel free to correct my mistakes
 
EinVer

EinVer

Super Veteran
NOTE:
- the 2nd LM3914 pin #6 (RHI) should be connected to the +5V green line (forgot to draw hehe)
- LM2917 pin #11, the diode there is 1N4148, forgot to label it

Bill of Materials

qty. parts price

1-----LM2917----------140
2-----LM3914----------180
3-----ic holder--------15
12----1/4w resistors----6
1-----var. resistor----15
2-----1N4148-----------16
------capacitors-------20 (estimate, might be less)
12m--#22 wires---------60
------PCB--------------15
------FeCl sol'n-------15
20----LEDs-------------70
1-----AN7810-----------30
1-----AN7805-----------30 (voltage regulators)
------casing-----------20
------misc-------------50
---------------------------------
----------------------682 (pretty cheap huh?)

parts are obtained from a local electronic shop
it should go lower if you'll purchase it in raon/alexan

as for the panel design
the sticker cost not more than 100 from Darkbenz Sticker Decal Shop
and the acrylic panel, well i got it for free from a friend
a reasonable price for it should be around 100 to 150 (i guess)

approximate total 900 pesos
+ labor and a lot of patience = priceless haha
 
goff_d_p

goff_d_p

Super Veteran
.
I know it's hard. But even my Googles translator couldn't translat that all. hehehe


Great job though. Nicely done bro
 
Sidro

Sidro

Super Veteran
kaw talaga papa einver, humble pa. hindi ka nga expert sa electronics/electrical pero gumagamit ng bread board, lupet mo papa. only experts/masters uses bread board for their prototype. galing mo!!!!!!!!
 
Sidro

Sidro

Super Veteran
paps ano voltage rating mo ng capacitor sa ckt ngLM3914? yung sa LM2917 is ceramic capcitors ba yun?
 
EinVer

EinVer

Super Veteran
@ Sidro - 50V rating for the electrolytic capacitor on the LM3914
we could use a lower voltage rating, i just happen to have a 50V
its there to support the current flowing to the LEDs if just in case the LEDs are wired more than half a meter from the ckt.

@ goff_d_p - sorry about that, i was being lazy last night
hopefully i'll have time to explain it in a detailed manner.

this was actually meant to be marketed specifically for our sniper
but the number one problem i encountered is fitting it to our stock panel
it took me 6 nights to assemble and fit it to our stock panel.
and 4 nights for my new panel (with the digital speedometer)
 
EinVer

EinVer

Super Veteran
elyouch said:
saludo ako sir...
sana sir gawa ka with gear indicator na din..para complete rekados na
Click to expand...
thanks sa mga papuri BUT
according to Alexan's training course, hindi pa ko papasa sa Basic Electronics with my knowledge HAHAHA

yung sa unang video, may LED gear indicator eh, simple lang, 1 LED + 600ohm resistor solved na
iniba iba ko yung kulay para madaling madistinguish, kaso kantyaw ng tropa ko sakin, xmas light daw haha
at medyo mahirap sya makita pag tanghaling tapat

I made another display for gear indicator, yung 0, 1, 2, 3, 4 ang display nya
tested on bread board as prototype, but never got the time to install and test it on my sniper
and now nagpalit na nga ko ng digital panel, so i think i don't need to use it hehe
post ko na rin mamayang gabi, pag nahalungkat ko yung schematics
drawing lang sa papel yun, pa scan ko muna hehe
 
pEkz

pEkz

Super Veteran
paps diba meron naman na LED na superbright? di ba kaya pag ganun gagamitin? BTW anung size nga pala ng LED na gamit mo?
 
Sidro

Sidro

Super Veteran
EinVer said:
elyouch said:
saludo ako sir...
sana sir gawa ka with gear indicator na din..para complete rekados na
Click to expand...
thanks sa mga papuri BUT
according to Alexan's training course, hindi pa ko papasa sa Basic Electronics with my knowledge HAHAHA

yung sa unang video, may LED gear indicator eh, simple lang, 1 LED + 600ohm resistor solved na
iniba iba ko yung kulay para madaling madistinguish, kaso kantyaw ng tropa ko sakin, xmas light daw haha
at medyo mahirap sya makita pag tanghaling tapat

I made another display for gear indicator, yung 0, 1, 2, 3, 4 ang display nya

tested on bread board as prototype, but never got the time to install and test it on my sniper
and now nagpalit na nga ko ng digital panel, so i think i don't need to use it hehe
post ko na rin mamayang gabi, pag nahalungkat ko yung schematics
drawing lang sa papel yun, pa scan ko muna hehe
Click to expand...
ok paps.. ang galing mo talaga,,,
 
E

elyouch

Super Veteran
EinVer said:
thanks sa mga papuri BUT
according to Alexan's training course, hindi pa ko papasa sa Basic Electronics with my knowledge HAHAHA

yung sa unang video, may LED gear indicator eh, simple lang, 1 LED + 600ohm resistor solved na
iniba iba ko yung kulay para madaling madistinguish, kaso kantyaw ng tropa ko sakin, xmas light daw haha
at medyo mahirap sya makita pag tanghaling tapat

I made another display for gear indicator, yung 0, 1, 2, 3, 4 ang display nya
tested on bread board as prototype, but never got the time to install and test it on my sniper
and now nagpalit na nga ko ng digital panel, so i think i don't need to use it hehe
post ko na rin mamayang gabi, pag nahalungkat ko yung schematics
drawing lang sa papel yun, pa scan ko muna hehe
Click to expand...
galing mo talaga sir.. isa kang alamat!
ung gear indicator na digital ba sinasabi mo no. 0-4 and display panel?
like sa raider ung digital ang gear indicator
un ba un..
 
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