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Forum Index : Microcontroller and PC projects : RP2040 Pico Temperature sensor Not supported
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phil99 Guru  Joined: 11/02/2018 Location: AustraliaPosts: 1781 |
An odd thing, on the PicoMiteVGA the value returned is proportional to CPUSPEED. Implausibly low at 126Mhz - below ambient. "4.9.5. Temperature Sensor The temperature sensor measures the Vbe voltage of a biased bipolar diode, connected to the fifth ADC channel (AINSEL=4). Typically, Vbe = 0.706V at 27 degrees C, with a slope of -1.721mV per degree. Therefore the temperature can be approximated as follows: T = 27 - (ADC_voltage - 0.706)/0.001721 As the Vbe and the Vbe slope can vary over the temperature range, and from device to device, some user calibration may be required if accurate measurements are required. The temperature sensor’s bias source must be enabled before use, via CS.TS_EN. This increases current consumption on ADC_AVDD by approximately 40 ?A. *** NOTE The on board temperature sensor is very sensitive to errors in the reference voltage. If the ADC returns a value of 891 this would correspond to a temperature of 20.1°C. However if the reference voltage is 1% lower than 3.3 V then the same reading of 891 would correspond to 24.3°C. You would see a change in temperature of over 4°C for a small 1% change in reference voltage. Therefore if you want to improve the accuracy of the internal temperature sensor it is worth considering adding an external reference voltage." Edited 2022-09-19 17:06 by phil99 |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5726 |
It's easy to put a finger on the RP2040. If the logo is burned into your finger tip then its too hot. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8579 |
Measure the exact voltage on ADC_VREF and then set OPTION VCC to that value. This will give you the most accurate value. NB: if you are using the optional LM4040 as a 3V reference you will get a crazy negative temperature unless you do this. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3658 |
Then DO NOT DO THAT! Use a PDF viewer with search feature, as has been advised. You are making your life VERY hard, just by not doing as advised. John |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5726 |
I very rarely use Edge as my browser, only as a PDF reader - something that I find it to be very good for. :) It saves having to have another application just to read PDFs. My browsers of choice are Pale Moon and De-Googled Chromium. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2287 |
this appears to be the default behavior of MS Windows these days, have noticed it when having to use other people's computers (i use Linux myself). i suspect that installing a 3rd party reader (Adobe, Foxit, etc) and persuading the operating system to use it as the new default is beyond the abilities of many Windows users - certainly Windows does not go out of its way to make changing the defaults easy for the user. cheers, rob :-) |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
Thank you sir. That was not difficult was it? I just got to check the rp2040 data sheet and is the pin supported in mmbasic picomite, which I did without success. |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3015 |
"Without success" in attempting exactly what, and which variety of "without success"? PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
I use Chromium for RPi. I am not the only win user who does not use edge :) Yet I am happy with Defender. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
10 times less than 0% success :) IE. I was not "spoon fed" code :( code of picomite reading it's temperature. I have lost interest now. Thought it would be easy and displaying temp using gui would be a cake walk/piece of cake. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
Thank you @Phil99. Very informative. I power picomite from 3.3V and notice that adc changes when the usb lead is removed so I got to sort the ad ref pin. |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9061 |
Deleted your duplicate post. I also use Opera, but I do use Foxit Reader for all my PDF stuff. As a wee prod, and to stop you losing interest, reading the 2040 temperature is how others have pointed out, so you would have a line in your code such as: T=PIN(TEMP) That will suck the temperature of the 2040 chip, and ram it into variable T. Then you can display it on the screen using the GUI CAPTION command if you are using GUI controls, or the TEXT command if you are NOT using any touch controls. GUI CAPTION and TEXT basically do the same thing on the screen, but the GUI command is monitored and controlled by MMBASIC in the background. If you are using ANY type of GUI controls, then EVERYTHING on the screen should be a GUI control - don't mix and match, if you see what I am getting at.  So, if you were using GUI controls, you would have a line to show the temperature like this: GUI CAPTION #1,STR$(T),100,100,L,RGB(WHITE),RGB(RED) This will draw the temperature of the 2040 saved in variable T, on the screen at position 100,100 with a white text and red background, which stands out. It does not really get any simpler then that, and the cake is never gonna taste any better then right now with those two lines of code. See the manual, page 91 for a description of the GUI CAPTION command for further details. If you just want to draw the temperature on the screen, and are NOT using any GUI buttons or controls, you can use the TEXT command to draw the same thing: TEXT 100,100,STR$(T),L,RGB(WHITE),RGB(RED) See page 118 for details of the TEXT command. We use the STR$ function, to convert the temperature number, into a string as the CAPTION and TEXT commands expect strings and won't work with just numbers - the interpreter will throw an "Expected a string" error if you try. You can combine both lines into ONE command if you like, like this: GUI CAPTION #1,STR$(PIN(TEMP)),100,100,L,RGB(WHITE),RGB(RED) or... TEXT 100,100,STR$(PIN(TEMP)),L,RGB(WHITE),RGB(RED) Good luck, and don't loose hope.  EDIT: Fix some formatting. Edited 2022-09-20 16:35 by Grogster Smoke makes things work. When the smoke gets out, it stops! |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
Thankyou for the detailed reply sir. I can read a-d to a gui dial SETPIN GP26, AIN cls gui gauge #1, 120, 160, 100, wh, bk, 0, 3.3, 2, "V", wh do myvoltage! = PIN(GP26) ''text 0,0,left$(str$(myvoltage!),4) CtrlVal(#1) =myvoltage! loop I use opera because it looks nice showing the pretty windows backgrounds.. sad :) The fake vpn gets me software. I think mmb can do nice dials etc. using trig and filled triangles. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
@Grogster - I have not given up, I still enjoy using mmb but temp was just a trivial experiment to try and learn more details I would need too implement a temp display. Picomite is new to me and after pic/avr is interesting. Totally different except there is a Basic for them and you do not get your money back... it is free software to code them. As a new user I am referring to the manual a lot but find I have to jump around the many pages. EG. I found the scale function 2 days ago and can not find it now. That was just an example not where is it :) Now other users will tell me the manual is perfect and I am lazy. It seems if you got nothing good to say then say nothing because nothing acts faster than Anadin Edited 2022-09-22 02:45 by stanleyella |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
@Grogster I know, not temp just voltage ,not stable?? https://youtu.be/tmSHe1ZXyZQ dim T! CONST bk = RGB(BLack) const wh = rgb(white) const bl = rgb(blue) const gr = rgb(green) const cy = rgb(cyan) const re = rgb(red) const ma = rgb(magenta) const ye = rgb(yellow) const br = rgb(brown) cls gui gauge #1, 120, 160, 100, wh, bk, 0, 3.3, 2, "T", wh do T!=PIN(TEMP) CtrlVal(#1) =T! loop |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1642 |
@Grogster... what is I am a "guru"? I am no !:@$%**ing guru! I am a newbie needing help for fox sake. Soz mate, just thought me posting carp makes me guru??? I have 8bit experience that could be used with mmb but not experienced enough to help. And forum help picaxe, gcbasic or mmbasic is so important for unseasoned users. Take care, stan Edited 2022-09-22 04:32 by stanleyella |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9061 |
What?! At what point did I suggest or say you were a Guru? Where are you getting that from? Please keep your posts civil - even if you ARE really annoyed at something not working, cos getting snotty at other members never ends well for the member doing it. Smoke makes things work. When the smoke gets out, it stops! |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 840 |
Hey Grogster - heal boy, heal. Stan has just noticed that his Avatar describes him as a "Guru" (automatically because of the number of posts). My interpretation is that he is denying that he is. I too have the same problem - enough posts to elevate me to Guru status when I am nothing more than a plodding lapsed-Civil Engineer. Cheers (in all senses of the word), Andrew |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9061 |
Oh, I see. I wish he had clarified that in his post, cos it read like I had said he was one, which I did not, and so I was wondering what the hell he was on about. Now I understand. Smoke makes things work. When the smoke gets out, it stops! |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 840 |
Grogs, No offense to me but I thought that someone might clarify the ambiguity. Andrew |
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