LCD screen

Looks like I'm building a frequency to voltage converter to send some speed data to this thing.
 
My item arrived yesterday.
This particular model:

http://www.ebay.com/itm/181479677729?_trksid=p2060778.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT

I have GNG mid drive kit, so phase wire connection is not an option.

Assuming that hall sensor delivers relatively lower pulse frequency than phase wire, I tried pulsing yelow ( Hall input ) wire directly on +5V
Speedo connection.JPG
Speedo started counting and evenly holds measured speed value for a few seconds.

So I took generic bike speedo magnetic reed sensor, inserted it between onboard +5V solder point and Hall input - and it works :)
Will try to calibrate it tomorrow by GPS.
 
The thing that puts me off bare LCD displays is the diy case and protecting the display from the weather- rainwater loves getting intothings.
 
I also bought this enclosure with transparent cover:

http://www.ebay.com/itm/191258243831?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Box size is 115 x 90 x 55mm ( inner 109mm x 84mm ) , Pcb size is 105 x 53mm - this will fit.
Maybe I manage to squeeze bare RC Watt meter board inside, too.
 
I've not seen the clear lid before, that opens up some nice possibilities. It would be easy to make an insert/mask so only the display shows through, for me that would improve the look a bit.
 
There are a few more different types out now:
Some monitor speed and have a trip meter and odometer; battery volts and temperature.
Some monitor battery current instead of temperature. The circuit uses the same input connections as were used for temperature, so they can't do both.

Some are multi colour http://www.ebay.com.au/itm/111454134482?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

Some are more like the Turnigy wattmeter but log Ah in both directions like the CA, so can log both charge and discharge Ah, time remaining for charge/discharge, A, V, W. The highest rated one I have seen is 80V 100A. It uses a 1m Ohm external shunt.
http://www.ebay.com.au/itm/251798950564?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
 
jateureka said:
There are a few more different types out now:
Some monitor speed and have a trip meter and odometer; battery volts and temperature.
Some monitor battery current instead of temperature. The circuit uses the same input connections as were used for temperature, so they can't do both.

Some are multi colour http://www.ebay.com.au/itm/111454134482?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Click to expand...
This one looks like a nice integration project. Are there available ready to use (with enclosure) units?
 
I haven't seen any ready to use. They are being sold as an upgrade or replacement (their term is 'refires') for your old analogue meters and some on AliExpress actually come with a new faceplate to mount it inside your e-bikes existing housing.
 
circuit said:
jateureka said:
There are a few more different types out now:
Some monitor speed and have a trip meter and odometer; battery volts and temperature.
Some monitor battery current instead of temperature. The circuit uses the same input connections as were used for temperature, so they can't do both.

Some are multi colour http://www.ebay.com.au/itm/111454134482?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Click to expand...
This one looks like a nice integration project. Are there available ready to use (with enclosure) units?
Click to expand...

Bought this item couple weeks ago and it arrived today. What I can say... Crap. First, actual screen shows different stuff, not as shown in ebay's listing. Second, there are 3 gear indicators and 8 error indicators, all of which are very small and with 2 to 5 chinese letters next to them. Some wires are not connected (probably for error signals) and their pcb pads are labeled in chinese as well. LCD's view angle is close to 0 degrees. I mean, there is no perfect angle for proper contrast.

Full story: https://translate.google.com/translate?sl=lt&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fe-motion.lt%2F2015%2F03%2F28%2Fe-dviracio-ekranas%2F&edit-text=
 
The seller I posted the link to, dz-stuido, has a 99.1% positive feedback rating, so I am surprised you did not get the same display as what is pictured in their sales post.
If you bought it with Paypal you could have gotten a full refund as the item is not as described because it does not match the picture. Did you ask for a refund?
The numbers 1/2/3 are for the 3 speed switch settings that most of the larger powered e-bikes & scooters have.
 
vax said:
A new find, it's wireless!
http://www.ebay.com/itm/New-Multifunction-Wireless-DC-Voltmeter-Ammeter-Power-Meter-0-120V-100A-Shunt-/121653709452?tfrom=111454134482&tpos=top&ttype=coupon&talgo=undefined
Click to expand...
Main characteristic: *has a casing*. Hahaha. Looks nice.
 
This is the one I like the most. :eek: I have two versions, one with ammeter box tool, and this one on the link without the ammeter and with termistor built-in half the cost. Interesting is that this work with 48V, 60V, 72V lithium-ion batteries, and ready to be connected to hall wire or phase wire.

http://www.aliexpress.com/item/mult...Auto-48-96V/32322735144.html?http_swift_null=


multifunction-Voltmeter-thermometer-speedometer-For-48V-60v-72v-car-Auto-48-96V.jpg
 
Here's my review of the above screen:

https://translate.google.com/translate?sl=lt&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fe-motion.lt%2F2015%2F03%2F28%2Fe-dviracio-ekranas%2F&edit-text=

It is hackable to some level. Worst problem - contrast and view angles.
 
under the "V" on the voltage indicator there is a "T" for temp. over the "V" there is a "A" for "amps".

If you don't connect the ammeter. it will show Voltage.

If you don't connect the ammeter and you add temp wiring it show temperature.
 
Nobuo said:
under the "V" on the voltage indicator there is a "T" for temp. over the "V" there is a "A" for "amps".

If you don't connect the ammeter. it will show Voltage.

If you don't connect the ammeter and you add temp wiring it show temperature.
Click to expand...
Its a shame it can't display both voltage and amps at the same time =(
 
Nobuo said:
of course :? . You can always check relation about voltage and the battery indicator bars. Make a swich to disconnect the amp wire on the screen, or just use external voltmeter.
Click to expand...
This lcd screen woul sell much more if it was open source, so we could mod the stuff. Ex: shows voltage for 2 seconds than shows amps for 5 seconds and keep switching, could also display wattage while crusing on mileage display and switch to mileage when stopped. Thats not hard to code since you have the source, which is not the case =(
 
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