Multiple ds18b20 on Emontx3.4

Submitted by truzzman on Sat, 28/02/2015 - 23:48

I spend my saturday afternoon to try to set up one Emontx3.4 firmware with 4 ds18b20 temperature sensor, but with no result....:-(((

Some suggestions ??

Thanks

Re: Multiple ds18b20 on Emontx3.4

Submitted by Robert Wall on Sun, 01/03/2015 - 02:49.

Look at https://github.com/openenergymonitor/emonTxFirmware/blob/master/emonTxV3..., but be certain you change the I/O ports to the correct ones for your emonTx V3.4, because that sketch is for an emonTx V3.2.

Without knowing what you have done, I can't help any more.

Re: Multiple ds18b20 on Emontx3.4

Submitted by truzzman on Sun, 01/03/2015 - 10:55.

Thank for the link, I understood all and now my four sensor are working.

First mod the payloadTX (line 80)

typedef struct { int power1, power2, power3, power4, Vrms, temp1, temp2, temp3, temp4; } PayloadTX;

Then I create four float to store temp value from array of sensors (deleted line 364 that call only sensor array position [0])

float temp1=(sensors.getTempC(allAddress[0]));
float temp2=(sensors.getTempC(allAddress[1]));
float temp3=(sensors.getTempC(allAddress[2]));
float temp4=(sensors.getTempC(allAddress[3]));

Control of value range and sending value to payload as in the original line 366 but changing the name of variable (the same also for temp2, temp 3 and temp4)

if ((temp1<125.0) && (temp1>-40.0)) emontx.temp1=(temp1*10);

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