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Topic: How to set up HM-10's with micro controllers for two way communication (Read 664 times) previous topic - next topic

Keith9159

I have a pressure sensor I want to read remotely, and also be able to control the solenoids to raise or lower the pressure from where the readout is. My current setup is the pressure sensor is connected to an Uno with an I2C LCD readout and a manual rocker switch to control the solenoids. I have two HM-10's, I want to incorporate  into the system so I can remotely read the pressure, and as well change the pressure. My plan is to move the LCD from the Uno, and install an HM-10. Then (remotely) on a Nano install the other HM-10 and the LCD screen, and I have a keypad I want to use to change the pressure. My thinking is to use the key pad to give the Uno a pressure to set to, then use a relay board controlled by the Uno to raise or lower the pressure. The solenoids are 12V and draw .6 amps.

1. Is this possible with the hardware I have?

2. Any tips or suggestions would be great.

Paul_KD7HB

Based on what you have described, it seems feasible. But, are your solenoids rated for continuous service?

Paul

Nick_Pyner

HM-10s are made with this sort of thing in mind.  The best info I know of is here.

Keith9159

The solenoids are not going to be powered constantly. They use pilot air pressure to control a valve that then raises or lowers the air pressure. They would only run for a few seconds tops, 12V @ .6 amps. I have a dual 12V relay board I am going to use.

As far as setting up the HM10's in "duplex" mode I am having issues finding that info concisely.... on forum/write up contradicts the next. I did however find one, but it did not give me very much info.

Nick_Pyner

http://www.martyncurrey.com/hm-10-bluetooth-4ble-modules/

Paul_KD7HB

The solenoids are not going to be powered constantly. They use pilot air pressure to control a valve that then raises or lowers the air pressure. They would only run for a few seconds tops, 12V @ .6 amps. I have a dual 12V relay board I am going to use.

As far as setting up the HM10's in "duplex" mode I am having issues finding that info concisely.... on forum/write up contradicts the next. I did however find one, but it did not give me very much info.
Strange type of piloted solenoid valves, then. My piloted irrigation solenoid valves, like yours, need very little current to open, BUT, they close as soon as power is removed. Bet yours do to.

Paul

Keith9159

Strange type of piloted solenoid valves, then. My piloted irrigation solenoid valves, like yours, need very little current to open, BUT, they close as soon as power is removed. Bet yours do to.

Paul
Correct, That is the reason they use pilot control, the strength of the solenoid doesn't have to be as great to get the same work done, hence a relay of sorts. I work for a John Deere dealership as a tech/technology specialist and that is how our hydraulic valves work too. They use a solenoid about the size of a "C" or "D" battery to control pilot oil that controls the spool that controls 3000 psi oil.

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