Search found 81 matches

by ajocius
Thu Apr 16, 2020 9:27 am
Forum: General Discussion and Questions
Topic: Multiple Onewire bus connections
Replies: 4
Views: 202

Re: Multiple Onewire bus connections

Had 1,8K and 1,2K. Tried with 1,8K and it reads them all! Thank you. Would be great to understand the logic behind.

Also, would be great to understand if two Onewire objects can be running within the code.

One step closer to moving sensors to greenhouse, just in time :)
by ajocius
Thu Apr 16, 2020 5:48 am
Forum: General Discussion and Questions
Topic: Multiple Onewire bus connections
Replies: 4
Views: 202

Multiple Onewire bus connections

I had working code for several DS18B20 sensors connected on one bus. However, once number of devices increased to 11 I started to get no readings from several sensors. Tried all sensors individually, all work fine, but once all 11 were connected, I got same issue. So I thought to try to split sensor...
by ajocius
Mon Mar 30, 2020 4:30 pm
Forum: ESP32 boards
Topic: DS18B20 readings are wrong
Replies: 10
Views: 465

Re: DS18B20 readings are wrong

Not sure how to post picture on this forum, tried with [img] and url from Google Photos, but picture does not show. After following graph for a day I see that lines are not always parallel. Need more testing...
by ajocius
Mon Mar 30, 2020 2:43 pm
Forum: ESP32 boards
Topic: DS18B20 readings are wrong
Replies: 10
Views: 465

Re: DS18B20 readings are wrong

I did find some suggestions to reduce pull up resistor value when sensor is connected to 3.3V, not 5V. Suggestion was to use 2,7 KOhm instead of 4.7 Ohm. Haven't tested yet, but then again, this parallel graphs indicates there is offset issue most likely, how you pointed out. Ordered some from trust...
by ajocius
Mon Mar 30, 2020 2:32 pm
Forum: ESP32 boards
Topic: DS18B20 readings are wrong
Replies: 10
Views: 465

Re: DS18B20 readings are wrong

great to find someone with similar use of devices and micropython. Is your pH meter and EC/PPM meter integrated into HA as well? If yes, what devices do you use?
by ajocius
Mon Mar 30, 2020 1:13 pm
Forum: ESP32 boards
Topic: DS18B20 readings are wrong
Replies: 10
Views: 465

Re: DS18B20 readings are wrong

Thx for quick response. Does that mean that you calculated individual offset per sensor and used simple procedure , like : 1. Reading temp 2. adding offset (can be positive or negative) 3. Using result temp? Besides constant offset, did you see any other malfunctions? I intend to use it in greenhous...
by ajocius
Mon Mar 30, 2020 11:36 am
Forum: ESP32 boards
Topic: DS18B20 readings are wrong
Replies: 10
Views: 465

DS18B20 readings are wrong

I have 5 DS18B20 temperature sensors connected via one wire non parasite to ESP32 running micropython. I do get readings that I post to influxdb and monitor over time. I noticed that all 5 sensors are reacting to temperature (increasing, decreasing), but seem to give me different readings. So graph ...
by ajocius
Mon Mar 23, 2020 7:53 pm
Forum: General Discussion and Questions
Topic: VCC pins usage for several sensors
Replies: 1
Views: 160

VCC pins usage for several sensors

I am using ESP32 with micropython code to read sensors data (mainly DHT22 and DS18B20 for temp and humidity). Both sensors that I mentioned use pull up resistor between data and VCC pins. Let say I want to connect 10 sensors (combo of above) to one ESP32. Can I use same VCC pin and 10 pull up resist...
by ajocius
Wed Feb 12, 2020 3:53 am
Forum: ESP32 boards
Topic: power supply options with output 5V
Replies: 3
Views: 276

Re: power supply options with output 5V

Can I power ESP32 via that 5V pin instead of using 3.7V power connector socket? This would be simpler solution in my project if it is possible. As I am already using down converter from 12V down to 3.7 to feed ESP32. So instead of adding boost converted in order to get 5V, I could instead adjust 12V...
by ajocius
Tue Feb 11, 2020 7:20 pm
Forum: ESP32 boards
Topic: power supply options with output 5V
Replies: 3
Views: 276

power supply options with output 5V

I have powered Wemos Lolin 32 ESP32 board via power supply (not USB) with 3,3V. I understand USB power input would be 5V, but on power input (which is separate connector) I need to supply 3,3V. Here is my board: https://wiki.wemos.cc/products:lolin32:lolin32 Question, is it possible to use 5V connec...