Hi
i kind want module for my truck heating pad in winter, i plug in for heating engine oil pan, but i want know a wireless module can give me feed back for if heating pad is on of not on, prefer temp senser element, but need min communication range about 500m, power supply is 110v ac, dont need to be compilated,

thank you

 

Why not just install a Thermostat on the Engine-Block or Oil-Pan ?
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i want know a wireless module

Is there a WiFi signal available at the truck?

 

Why not just install a Thermostat on the Engine-Block or Oil-Pan ?
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i can not leave control room during work.

 

Is there a WiFi signal available at the truck?

No, wifi not good idea, siginal need through building

 

Why would You need to "leave the Control-Room" with a
Thermostat keeping the Engine warm automatically ?
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Why would You need to "leave the Control-Room" with a
Thermostat keeping the Engine warm automatically ?
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…can give me feed back for if heating pad is on [or] not on…

It appears the TS is looking for status information in case the heater is not operational, not control. No doubt the heater is already thermostatically controlled, but remote and so operational state is not available.

need min communication range about 500m

No, wifi not good idea, siginal need through building

Unfortunately, this may be asking a lot. Part of the answer depends on location and the regulatory situation. Your requirements will demand an unusually powerful transmitter and just what sort of limitations the law places on the type of device you need will vary.

You will need to determine which frequency band you will be allowed to operate in, and how much on-air time you will be allowed. You will have to work out whether you are allowed to broadcast or only to poll. You will also have to figure out what will be on the receiving side to interface with the data from the remote one.

The truth is, Wi-Fi, with a dedicated AP (Access Point) and possibly one or more extenders, may be your best bet. You might have to repurpose an old phone or tablet as the remote display which would live on the private Wi-Fi network since it will not be the one that you would otherwise connect to.

At that point you could use one of many smart outlets that are cheap and provide power consumption data. For example, I have used these Sonoff smart outlets with excellent results. They won’t provide temperature but they will show power consumption over the associated free app.

Alternatively, you could be a little more sophisticated and use a Shelly Plus smart outlet or relay and a Shelly Plus Add On module that provides temperature sensing. Shelly’s app is excellent.

But, I strongly suggest you start by working out how to establish a private Wi-Fi network that covers the truck and control room with 2.4GHz Wi-Fi. Not only is the 2.4GHz band more capable of penetration, almost every IoT device that supports Wi-Fi is limited to 2.4GHz.

This means even older, cheaper equipment will work will is nice. Since you don’t need WAN connectivity you only need an AP and not a router. A router will work, it’s just overkill—but may be the cheapest option anyway.

You may need to use gain (directional) antenna(s) and possibly a repeater (extender) but in the end I believe if you solve the problem of Wi-Fi it opens the field for a number of simple solutions that can’t be matched by the cost and complexity (interface, regulatory compliance, &c) of a direct connection to the truck.

It is also likely to end up cheaper even though there is more equipment involved, and if the signal is marginal you can improve it much more easily than the direct alternative.

Good luck.

 

There is an easy solution that is wireless. If the supply is 120 volts AC, add a thermostat to sense the heater operation. then for inside the thermostat to switch on a light bulb positioned on the truck so that it can be seen from that 500m distance. Totally wireless and very effective

 

There is an easy solution that is wireless. If the supply is 120 volts AC, add a thermostat to sense the heater operation. then for inside the thermostat to switch on a light bulb positioned on the truck so that it can be seen from that 500m distance. Totally wireless and very effective

that is good idea, but i will unable to see during day time.

 

that is good idea, but i will unable to see during day time.

Use a colored light and a flasher.

 

OK, so the simple easy low-tech approach does not work with daylight. So it would be back to a RF type wireless link That spectrum is much more tightly regulated. And now the legal equipment with adequate range is more expensive.

 

OK, so not wifi nor blutooth, they lack the range. So a pair of tranceivers, possibly family radio service band, which can make it all legal, at least in the US. Then a scheme where sending a particular tone triggers a response that includes information about the engine temperature. That can be as simple as an audio oscillator with the frequency controlled by a termistor. Then the trick is to sense the trigger tone and respond with a short transmission of the temperature controlled tone. OR the system could respond to any tone that was loud enough, and just transmit for a few seconds. So now the functionality is defined it is a matter of creating the circuit. The radio in the truch would be easiest too use if it had connectors for a headphone and a push-to-talk microphone. Might even get away with using a CB radio, except antennas might be a problem.