Help - Temperature -  humditiy display project - Page 1
Forum section: electronics / beginners

author: Gp!
author_rank: Contributor
timestamp: March 01, 2020, 06:10:49 pm
content: Hi,absolute newbie here. I would appreciate any help in finding a circuit design for a temperature - humidity display project (not based on arduino or (Rasberry Pi) I would like to start.I to start this old school project to learn, but it seems finding something online is equivalent to looking for the holy grail. I must be using the wrong search terms or maybe I have bitten off more than I can chew but nothing is coming up.In any case the whole point is to try and understand how the circuit works and then build my own (even though they are dirt cheap on Ebay).Thanks in advance for pointing me in the right direction.

author: johankj
author_rank: Contributor
timestamp: March 05, 2020, 02:24:46 pm
content: What exactly is it that you want to do? I 've made a temperature/humidity-display as a decorative piece, but I've used an Arduino (ATMEGA). I guesse I could have written it in C/C++, bypassing the Arduino. I'm happy to share any details.

author: atmfjstc
author_rank: Regular Contributor
timestamp: March 05, 2020, 05:42:15 pm
content: If you're not using a CPU or microcontroller, how are you planning to display the output? 7-segment LED displays? LED bars?

author: johankj
author_rank: Contributor
timestamp: March 06, 2020, 07:52:59 am
content: Quote from: atmfjstc on March 05, 2020, 05:42:15 pmI guess he could do it with discrete components (but why?): thermocouple -> ADC -> 7-segment driver

author: beanflying
author_rank: Super Contributor
timestamp: March 06, 2020, 08:08:51 am
content: For a beginners project not using an Arduino or PI is doing it the hard way 'electronically'. It can be done as mentioned with discrete components for sensing and driving the display but it is far less trivial than using a micro controller.So unless I misunderstand your English translation this is not for a school project requirement but it is just a learning exercise then using an Arduino will be the most simple to do initially? Then take what you have learned and try again without the Arduino/PI using discrete components and sensors as lesson two.https://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/is a simple Arduino based example complete with display.

author: Gp!
author_rank: Contributor
timestamp: March 11, 2020, 06:30:19 pm
content: Thanks,This is what I was hoping to do, LED 7 segment displays.I was just surprised that there was so little information on using discrete components.Thanks again for the advice.

author: Gp!
author_rank: Contributor
timestamp: March 20, 2020, 09:47:32 am
content: Quote from: johankj on March 05, 2020, 02:24:46 pmI am actually looking to something exactly like yours but to be placed outside.In my learning curve (I think I have bitten off more than I can chew) that last part will be the very very last on my list.May I see what you have done ?Thanks for now.

author: johankj
author_rank: Contributor
timestamp: March 20, 2020, 10:08:20 am
content: Don't worry, you can do this.You can encapsulate this if you need to.Here is the schematic:Code is attached.RHT_Ornament.txt

author: Gp!
author_rank: Contributor
timestamp: March 20, 2020, 04:42:07 pm
content: Thank you very much !That was very kind of you.I am looking forward to studying this.