Temp sensor that's too cool not to share

I was thinking of bundling the halls and temp sensor wires together and heat shrinking them for security.
I dunnu, I guess I should just read the 20 page post lfp started on using 10awg wire in the 9c.
 
Update on the sure temp sensor: Performed well all summer. Battery pack never got hot (above 120f), but the charger in the box sure did! Even with fans!

I'm about to install the hobby king VT temp sensor in my hub:

1) What epoxy to use? I've got some locally with a max temp rating of 150c. That's the limit for my hub as far as I'm concerned, so I'm not too worried.

2) Where do I glue the sensor? It's kinda big, and I don't want to worry about it rubbing on the cover.

3) I was thinking of installing one of these LEDS inside the hub just for fun. http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8941

LED-S-RE.jpg


They should run off 5v. I was going to epoxy it in with the sensor. If it dies, it dies. No biggie. Can I run it off the hall sensor, or the temp sensor voltage?
 
I doubt the 5V from the controller can supply enough current to run them. You'll probably need an external source. How much current do they take, at 5V?
 
dammit doctorbass, that's all i needed right now, another site with 60,000 cool gadgets. thanks, ya bastard. see y'all next week, lol
 
The Ikea Fantast at $6.99 is also a good thermometer for ebikers.
http://www.ikea.com/us/en/catalog/products/80100406/

I wrote about modding one on my blog.
http://ebikerider.blogspot.com/2011/09/ikea-fantast-thermometer.html
 
I'm still using the HK VT - http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=9744

It works great. Only thing I don't like is that it cycles between temp and voltage. The alarm is loud enough and the blue LED alarm lights are a nice touch. The 150c limit hasn't been an issue because by the time the motor hits 120c, it's a boggy ride anyways. Really no point in pushing the motor harder than that.

I've found out that the sensor itself is a $1 LM35

Which opens up fun options for installing multiple sensors on the controller or battery pack. Just wire them up to a switch to change the temp sensor source.
 
You can find those on some motherboards, too. Sometimes three or four of them. ALso on harddisk control boards, here and there.
 
BTW.

I picked up the first piece of crap walmart temp sensor i came across and it worked great.
Nothing special needed. Just something with a wire coming out of it :lol:

tempsensor.jpg
 
Here's a discussion about buying a $1 probe, and hooking it up to a CycleAnalyst

"ebikessf's 2k thermal sensor?"
http://endless-sphere.com/forums/viewtopic.php?f=2&t=38830

The LM35 is also the temp probe inside the RC charger temp functions, which I assume will shut down the power when the probe senses that the battery that is getting charged has started to get hot:

t1771150-55-thumb-IMAX_B6_LM35_Temp_Sensor_Wiring.jpg

file.php


The last type of temp probe is the three-wire devices such as the LM35. Internally, these are similar to #2 above, however they require +5V and GND, and then output a voltage on their own, so they do not require a pullup. The LM35, as an example, is calibrated in degrees C rather than degrees K, at 10mv / degree, so that the output can be read directly on a cheap voltmeter (.50 volts = 50 degrees, 1.10 volts = 110 degrees, etc.
Click to expand...
 
auraslip said:
I'm still using the HK VT - http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=9744
...I've found out that the sensor itself is a $1 LM35
Click to expand...
u sure about that? HK reviewersaid it was an LM37.. any diff? LM 35 also compatible w/ display?

reason i ask, i have an extra LM35 on hand and want to install in motor and then hook up to HK temp sensor. i don't want to have to wait a couple weeks for an HK sensor!

thanks!
 
auraslip said:
Oh... I don't know. It may be a mistake on my part.
Click to expand...
actually, i think it's a mistake on the reviewer's part. from more hasty searching, i can't find LM37.

lots more to supportit being an LM35...

thanks. i probably should have read JP's post from herebetter:

Joe Perez said:
There are three other major types of temperature-sensing devices in common use, and I suspect that that you have one of them.

The first, which is the only device properly named a thermistor, is a variable resistor whose resistance changes with temperature, either increasing as temperture rises (PTC, or Positive Temperature Coefficient) or falling as temperature rises (NTC, or Negative Temperature Coefficient.) These devices have two wires, of which one is usually grounded and the other has a pullup voltage applied through a fixed resistance, thus forming a voltage-divider.

The second is essentially a zener diode whose reverse breakdown voltage changes with temperature. These are also two-wire devices, and are used in a similar manner to thermistors. An example of this would be the Texas Instruments LM335.

Finally, there's a class of devices which are internally similar to the above, but which contain active circuitry and output a positive voltage proportional to temperature. These are three-wire devices, and an example would be the TI LM35.
Click to expand...
 
I have a question about the HK sensor. After reinstalling the motor the temp sensor shows 164c. It's like it's shorted, but it shows no shorts with a DMM. Could the LM35 be shorted when it powers up?
The white sensor wire (not the ground or V+) was broken at the connector so it's possible it could of shorted out on something.
 
i asked the same q here.

i thought the 164 alarm came when the connector was flipped, but it's not doing it now, so perhaps there was something else wrong.

i have mine hooked up:

VT +: NOTHING
VT GND: NOTHING
VT sensor connector black: Hall GND
VT White sensor wire: Hall +
VT red sensor wire: LM 35 sensor wire...

more wiring info here.
 
I ended up ditching the hobbyking vt sensor because you can only read it in sunlight if you cup you hand around the display and peek through the little hole.
This is very frustrating if you are on a bumpy road.
As an added bonus TG3 is really light weight, so instead of having to zip tie it or something, you can simply sticky velcro it to your handlebars.
 
Anybody hacked something like this for a motor temp probe? Looks like the business end is similar to Doctorbass's BBQ probe, with a display that's smaller and will read in full sun. Temp range is right too.

http://www.amazon.com/Taylor-9842-Commercial-Waterproof-Thermometer/dp/B00009WE45/ref=pd_bxgy_hg_img_y

411TTK6Y5TL._SX450_.jpg
 
Beachcruzer said:
Anybody hacked something like this for a motor temp probe? Looks like the business end is similar to Doctorbass's BBQ probe, with a display that's smaller and will read in full sun. Temp range is right too.

http://www.amazon.com/Taylor-9842-Commercial-Waterproof-Thermometer/dp/B00009WE45/ref=pd_bxgy_hg_img_y

View attachment 2
Click to expand...

So in the spirit of answering my own question, I gambled $10 on a cheap BBQ thermometer, hacked it to bits, and installed it in my 9C. I have declared victory and put the play-by-play and pictures here. http://endless-sphere.com/forums/viewtopic.php?f=30&t=44110&p=642296#p642296

5.jpg

I'm happy with this solution because the short stab-the-meat-once probes like this one have much smaller displays that fit better on the handlebars. What I give up is the programmable alarm, but I think I'm paranoid enough when riding hard that that won't be an issue.

9.jpg
 
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