There are several threads on here about issues with the popular DHT22 sensors, this is an attempt to summarise them in one place.  To begin, there are actually multiple things sold as DHT22's, the main ones being the raw sensors with 4 pins:

   

and the other being DHT22 modules with 3 wires and built-in pullup resistors and decoupling capacitors:

   

A problem with these is that they're specced for 3.3 - 5V operation (even if some sites incorrectly claim 3 - 5V), so in theory can't be powered from the 3V output on the GPIO connector and need to be power from the 5V pin on the 433 MHz connector.

However at least for the KC868 A16v3 I've found that both the DHT22 4-pin and the DHT22 3-wire work fine on 3V (as well as 5V).  However the 3-wire module is far more reliable than the 4-pin sensor, the 3-wire is immediately detected and updates consistently while the 4-pin takes several minutes to be detected and barely every updates.

It'd be interesting to hear the experiences others have had with different DHT22 sensors.

Hi everyone, I'm having trouble uploading data to my KinCony KC868-A6 v1.3SP board and would really appreciate some help.
This morning I got home and, to my disappointment, the board wasn’t working. I finally had time to try uploading my firmware again, but it’s not working.

• The board’s LED is on as usual.
  
• The USB connection is recognized by my computer.
  
• However, in the SPDownload tool, the board info doesn’t appear — it seems like it’s not being detected properly.
  
• I’ve tested four different USB cables (all confirmed to work for data transfer on my Samsung smartphone).
  
• I don’t have any sensors connected to the board right now.
  
• There were no power surges or electrical issues today, so I doubt the ESP32 is fried.
  

Attached Files

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you can easy to chose product at here: https://mq.kincony.com/qq/product/product-selector

Suggested Topic & Payload
SUBSCRIBE MQTT Topic:
KC686-A6/SELFMACADRESS/status

Payload (published every 60 seconds by esp):
{
  "sku": "KC686-A6",
  "version": "XX.XXX.XX",
  "mac": "SELFMACADRESS",
  "ip": "IP",
  "ssid": "dw360-4g",
  "macrouter": "WIFIMAC",
  "rssi": -64,
  "ut": 125,
  "ts": 1744429741
}

• Interval: Every 60 seconds
  
• Field  ut : Incremented uptime in minutes since last boot
  
• Field ts : Current Unix timestamp (in seconds)
  
• Purpose: Provides a periodic heartbeat/status update from the device
  

Hi, All

1) Is there any database (or table) of all controllers to choose the interfaces i need ? Some cross-reference table.

2) Now i need all docs (schematic at least) of the 3-pin relay controllers of all possible channels qty. 4\8\10\12\16\24\32\64 pcs of channels, but with 3-pins NO\NC\COM. 

Separate product articles on the web-site are not unified structure, it needs to check each - maybe can you help to get all relay models sch together ?

v3.9.1 improvement:
1. fixed bug with KC868-A16v3 digital input ports.
2. fixed bug with DHT22 sensor.

Attached Files

  KCS_A2V3_V3.9.1.zip (Size: 1.03 MB / Downloads: 355)
  KCS_A6V3_V3.9.1.zip (Size: 1.01 MB / Downloads: 393)
  KCS_A8V3_V3.9.1.zip (Size: 1.06 MB / Downloads: 356)
  KCS_A16V3_V3.9.1.zip (Size: 1.08 MB / Downloads: 455)
  KCS_A32PRO_V3.9.1.zip (Size: 1.05 MB / Downloads: 380)
  KCS_AG8_V3.9.1.zip (Size: 1.04 MB / Downloads: 376)
  KCS_B8M_V3.9.1.zip (Size: 1.07 MB / Downloads: 350)
  KCS_B16_V3.9.1.zip (Size: 1.07 MB / Downloads: 373)
  KCS_B16M_V3.9.1.zip (Size: 1.07 MB / Downloads: 361)
  KCS_F8_V3.9.1.zip (Size: 1.06 MB / Downloads: 349)
  KCS_F16_V3.9.1.zip (Size: 1.08 MB / Downloads: 353)
  KCS_F24_V3.9.1.zip (Size: 1.08 MB / Downloads: 321)
  KCS_G1_V3.9.1.zip (Size: 1.03 MB / Downloads: 324)
  KCS_KC_TA_V3.9.1.zip (Size: 1.03 MB / Downloads: 366)
  KCS_T16M_V3.9.1.zip (Size: 1.02 MB / Downloads: 365)

Please, I wanted to use the output channel of the A16 to turn on or off the camera when needed. What is the maximum current supported for each mosfet output channel?

Hi
I want to control and dim 24v LED strips using a controller like KC868-A4S. I'm looking for any recommendations for drivers.

I've tried Meanwell ELG-200-24B. But it doesn't turn off completely.

Any inputs are appreciated.

I'm trying to use meanwell ELG-200-24B to drive 24v LED drive strips using A4S and the LED does not completely turn off. When I checked, there is ~0.58V across the analog output and ground.

What am I doing wrong?

This is an ongoing project, and I plan to deploy the station in a month or so.  This setup leverages class B scientific grade meteorological instruments polled over serial MODBUS.  The controller enclosure's environment is monitored by a Kilcony RS-485 temperature and relative humidity RTU, and barometric pressure is monitored by a BMP280 over I2C.  The code base is in C i.e. ESP-IDF, and a sample implementation is available here.

Telemetry data model: