EcoRenovator - View Single Post - Solar Differential Controller Arduino Code

buffalobillpatrick · 08-09-14, 10:38 PM

Yes it's running. No shield is needed.

10K NTC sensors connect at
#define PANEL_sensor A2
#define TANK_sensor A3

see: https://learn.adafruit.com/thermistor?view=all

A voltage divider circuit is built. A 10K 1% resistor is soldered in series with 10K NTC thermistor & wired across +5 & Gnd.

The sensor wire to A2 or A3 wire is soldered to the middle of voltage divider.

Every brand of 10K NTC Thermistor possibly has a different Beta which "YOU" would specify in the Read_10K_NTC function.

The ones I'm using are:
// The beta coefficient of the thermistor (usually 3000-4000)
#define BCOEFFICIENT 3892

You could also:
#define ON_DELTA 16 or 20
#define OFF_DELTA 2 or 3
instead of 5K pots, but I like pots instead of re-compiling 5 years from now.

08-09-14, 10:38 PM	#3
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	Yes it's running. No shield is needed. 10K NTC sensors connect at #define PANEL_sensor A2 #define TANK_sensor A3 see: https://learn.adafruit.com/thermistor?view=all A voltage divider circuit is built. A 10K 1% resistor is soldered in series with 10K NTC thermistor & wired across +5 & Gnd. The sensor wire to A2 or A3 wire is soldered to the middle of voltage divider. Every brand of 10K NTC Thermistor possibly has a different Beta which "YOU" would specify in the Read_10K_NTC function. The ones I'm using are: // The beta coefficient of the thermistor (usually 3000-4000) #define BCOEFFICIENT 3892 You could also: #define ON_DELTA 16 or 20 #define OFF_DELTA 2 or 3 instead of 5K pots, but I like pots instead of re-compiling 5 years from now. Last edited by buffalobillpatrick; 08-09-14 at 10:51 PM..