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+--- Thread: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome (/showthread.php?tid=1093)
Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - admin - 11-10-2021
esphome:
name: kc868-a4
platform: ESP32
board: esp32dev
output:
- platform: esp32_dac
pin: GPIO25
id: dac_output2
- platform: esp32_dac
pin: GPIO26
id: dac_output1
light:
- platform: monochromatic
output: dac_output1
name: "KC868-A4-DAC1"
gamma_correct: 2
id: dac_light1
- platform: monochromatic
output: dac_output2
name: "KC868-A4-DAC2"
id: dac_light2
# Enable logging
logger:
# Enable Home Assistant API
api:
ota:
password: "3b853165e19b67ba8193c59fe59f21a7"
wifi:
ssid: "KinCony"
password: "a12345678"
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Kc868-A4 Fallback Hotspot"
password: "RgIGz8qo4bVC"
captive_portal:
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - Tomek - 11-25-2022
Hi Admins,
I use KC868-A4 with esphome.
I have problem with DAC output, in my case is to low. Max i have 9.45V. But i need 9.8V minimum. What i can do in my problem
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - admin - 11-26-2022
what's your power supply voltage?
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - Tomek - 11-27-2022
(11-26-2022, 12:02 AM)admin Wrote: what's your power supply voltage?
DC 12V 2A with voltage adjust. Now i set 12,3V but it did nothing. I tried two other power supplies (DC 12V 5A, and 1,67A), same result.
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - Tomek - 11-30-2022
So any idea? Why can't get 10V ?
On your video about DAC is 9,5V. It's max?
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - admin - 11-30-2022
1. you can check your PCB 3.3v Vcc pin whether is well. whether it's 3.3v value.
now R37,R38,R47,R49 all are 10K resistance.
if use 20K resistance , MAX DAC voltage should be: 3.3v * (1 + 20K/10K) = 9.9V
2. if Vcc is 3.3v work well , you can try to replace 20K resistance to 22K for a test. it should be output MAX 10.05V
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - bas_vdl - 02-05-2023
(11-30-2022, 08:39 AM)Tomek Wrote: So any idea? Why can't get 10V ?
On your video about DAC is 9,5V. It's max?
Were you able to solve it? I'm looking into this board to control my gas fireplace which needs 0v (off) and 10v (2 burners, high flames).
Thanks!
(11-30-2022, 09:04 AM)admin Wrote: 1. you can check your PCB 3.3v Vcc pin whether is well. whether it's 3.3v value.
now R37,R38,R47,R49 all are 10K resistance.
if use 20K resistance , MAX DAC voltage should be: 3.3v * (1 + 20K/10K) = 9.9V
2. if Vcc is 3.3v work well , you can try to replace 20K resistance to 22K for a test. it should be output MAX 10.05V
Hi, I have a couple of questions, hope you find the time.
Which is one the Vcc pin?
And where i should put the 20k or 22k resistance?
And will it also be able to produce 0V?
Thanks!
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - admin - 02-06-2023
Which is one the Vcc pin? that is 5V , see text on the PCB.
And where i should put the 20k or 22k resistance? R37,R38,R47,R49
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - rtoivo - 08-12-2023
I'm using node red in home assistant.
I have tried several various ways to control DAC (percentage value) from node red without success.
Output is working fine in lovelace.
Could you show an example how control should be done in node red?
RE: Lesson28- How to use KC868-A4 (ESP32) DAC output DC 0-10V by ESPHome - admin - 08-12-2023
which board you are using? if use KC868-A4 board, i think you can download "KCS" v2 firmware, then integrate to Node-Red by MQTT.