Smart Humidity and Temperature sensor TH02 Library

Reply to Smart Humidity and Temperature sensor TH02 Library on Fri, 08 Jan 2016 01:58:15 GMT

Charles — Fri, 08 Jan 2016 01:58:15 GMT

Guys,

Humm, that's interesting, I already fixed a problem with negative values in library (see ). As far As I remember this fixed the problem (but may be it's another issue now)
Are you using the latest version ?

Reply to Smart Humidity and Temperature sensor TH02 Library on Wed, 06 Jan 2016 02:47:05 GMT

chrisb — Wed, 06 Jan 2016 02:47:05 GMT

@Lensdigital
That would make a lot more sense than what I was thinking with the humidity sensor heater, especially with the way it "drops" when I pull it out of the freezer. -10 C also matches the outdoor temp when I was trying it outside.
I'm glad you caught this!
Chris

Reply to Smart Humidity and Temperature sensor TH02 Library on Wed, 06 Jan 2016 00:21:29 GMT

Lensdigital — Wed, 06 Jan 2016 00:21:29 GMT

I'm also seeing issue with sensor not working with temperatures below 0C
I don't think it's heating of the sensor. I think you are loosing negative sign somewhere. Mine shows 6C when it's -6C for example...
Wrong type of variables somewhere in the library?

Reply to Smart Humidity and Temperature sensor TH02 Library on Sun, 03 Jan 2016 18:25:59 GMT

chrisb — Sun, 03 Jan 2016 18:25:59 GMT

@Charles
Here's the output from that bit of code where it drops down to the lowest value and starts to rise back up. Another strange thing I noticed was when I pulled it out of the freezer the temp dropped again like it started reading the temp of the somewhat frozen board again and you could see it warm back up to room temp.

TH02 Demo
Scanning I2C bus ...
I2C device found at address 0x40-> TH02 !
I2C device found at address 0x6F-> Unknown device !
Scan done
TH02 device ID = 0x50
TH02 device ID match !
TH02 Status = 0x00
TH02 Config = 0x30
//**edited for brevity**
Start: Config=31: Temp 0.18 C => 0.10 C
Start: Config=31: Temp 0.06 C => 0.20 C
Start: Config=31: Temp 0.19 C => 0.30 C
Start: Config=31: Temp 0.29 C => 0.40 C
Start: Config=31: Temp 0.41 C => 0.60 C
Start: Config=31: Temp 0.57 C => 0.70 C
Start: Config=31: Temp 0.66 C => 0.80 C

Reply to Smart Humidity and Temperature sensor TH02 Library on Sat, 02 Jan 2016 21:12:00 GMT

Charles — Sat, 02 Jan 2016 21:12:00 GMT

@chrisb
thanks for the comment.

To be honest, I never tested the heater so I could be not "bug free"

Could you try this and post serial result ?

uint8_t cfg;
th02.startTempConv(true, false);
if (th02.getConfig(&cfg)==0) {
  serial.print("Config=");
  serial.println(cfg,HEX);
} else {
  serial.println("Read error");
}

Reply to Smart Humidity and Temperature sensor TH02 Library on Sat, 02 Jan 2016 03:59:23 GMT

chrisb — Sat, 02 Jan 2016 03:59:23 GMT

Also I would like to say I'm very green to this, so please do not rule out the obvious .
Thank you,
Chris

Reply to Smart Humidity and Temperature sensor TH02 Library on Sat, 02 Jan 2016 03:57:19 GMT

chrisb — Sat, 02 Jan 2016 03:57:19 GMT

Hello Charles,
First I'd like to say a big thank you for creating this library, it's been a big help for a capstone project I'm on for my bachelors degree. I've ran into a bit of an issue though and I think I know the cause, but I'm a bit stuck and was hoping you may be able to confirm my suspicion. I'm using this with an Anarduino to pull temps using a hopefm RFM69 chip at 915 mhz. I set the chip up inside and it seems to be measuring ~70F like it's suposed to, then when I move the sensor outside (where it's currently 13F) I watch the temp drop down to 32F, and then it climbs up to 55F I believe that the heater in the Humidity portion is turning on but in my code I'm only starting TempConv and I after looking into the library files I did update that to attempt to keep the heater off by using, "th02.startTempConv(true, false);"

Can you tell me if I may be missing something, or if there is something else I should be looking into? when I bring it back in, the temps are within range again, so I'm fairly certain that it's not a wiring issue.
Thanks,
Chris