Tagged Questions

1
vote
2answers
117 views

What kind of Relay Reacts to Ohms?

I need to connect a relay to my old truck to turn on the "soon to add" electric fans. The ECM has an engine coolant temperature sensor that uses the output resistance to determine coolant ...
6
votes
5answers
2k views

Temperature sensors for an Arduino sous-vide project

I'm creating a PID controller for sous-vide, like this one, and am trying to decide which temperature sensor to get. Priorities: Cost: < £25 delivered in the UK Accuracy: +/- 0.5C Range: 0 - ...
0
votes
1answer
394 views

ROV (underwater) temperature sensor design considerations

I'm the 'technician' for a SeaPerch ROV team (since I know the most about electronics) and I need an underwater temperature sensor able to mount on a ROV. Since I don't have much experience with ...
8
votes
3answers
1k views

Op Amp circuit not behaving as desired

Found a circuit on the net that should do exactily what I want (control a cooling fan) but it is 'on' all the time. Not sure if there is an error with the schematic or if there is something else I've ...
4
votes
4answers
1k views

Differences between thermistors and thermocouples

As I understand it, both thermistors and thermocouples are temperature sensors. So what are the advantages/disadvantages of using one over the other to measure the temperature? What are the specific ...
4
votes
4answers
267 views

Alternative to NTC Thermistor

I am designing a system which turns on at 45 degC. I want to place a device in series with my circuit that ideally has infinite resistance below 45 degC and then 0 resistance above 45 degC. I guess ...
1
vote
1answer
137 views

Measuring temperature of microcontroller and other large ICs

I'm going to be using a microcontroller and SDRAM IC in an enclosure that could, given some environmental variables that I have no control or knowledge of, get too hot for the devices to work ...