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U1
Not Recommended for New Designs
Can you connect the relay to the esp32. so the esp32 can use one of it's pins to...
d4zenl

d4zenl

@copilot Can you connect the relay to the esp32. so the esp32 can use one of it's pins to switch mains power
2y

copilot

Absolutely! Let's assume you'll be using GPIO5 to control the relay, specifically the relay module that you have labeled as K1. Here's how you can connect the relay to the ESP32 to switch mains power.
I am assuming the relay operates with 3.3V for the control signal since you are using an ESP32, which operates on 3.3V logic levels.
Connections
  1. Relay Control Signal:
    • Connect ESP32_C3:IO5 to K1:1 (Assuming K1:1 is the control pin for the relay).
  2. Relay Power Supply:
    • Connect a 5V power supply (which should be suitable for your relay if it's a typical relay module) to K1:2 (VCC).
  3. Relay Ground:
    • Connect GND to K1:3 (GND).
  4. Relay Common and Normally Open/Closed Contacts:
    • Connect the common terminal (usually labeled COM or C) of the relay to the load (e.g., appliance).
    • Connect the Normally Open (NO) or Normally Closed (NC) terminal to either the mains live wire or the neutral, depending on how you want to control the switching.
Connection Format
Here's the specific connection format:
  • Control Pin: Connect U1:IO5 to K1:1.
  • Power Supply (assuming VCC 5V): Connect VCC 5V:P1 to K1:2.
  • Ground: Connect GND to K1:3.
Example Schematic Snippet 
Plaintext
ESP32      -----> K1
  VDD 3V3   |      |   // power
            |      |   // control signal
  GND       |------|   // ground
            |      |
  IO5 ------|-> IN |   // control signal from ESP32
  // Connect ESP32 U1:IO5 to K1:1 for control
  // Connect VCC 5V:P1 to K1:2 for power
  // Connect GND to K1:3 for ground
Please make sure to double-check your relay module's datasheet to confirm the correct pins for power, ground, and control.
Would you like me to generate a more detailed explanation or any other connections you might need?
2y
2
R3
Resistance
5.1kฮฉ
Boot
R6
Resistance
100kฮฉ
D1
D2
R5
D3
R1
Resistance
10kฮฉ
R4
Resistance
10kฮฉ
Reset
R2
Resistance
5.1kฮฉ
VCC 5V
U2
GPIO9
GPIO2
GPIO8
GPIO19
VBUS
VDD 3V3
GPIO3
VDD 3V3
GPIO18
GPIO8
VDD 3V3
GPIO1
GPIO10
GPIO9
VDD 3V3
GPIO7
BATT+
VCC 5V
GPIO0
GPIO5
GPIO19
U0TXD
GPIO6
GPIO2
GPIO4
U0RXD
VBUS
GPIO18
U3
Not Recommended for New Designs
C5
Capacitance
10uF
K1
C4
Capacitance
10uF
D4
J1
C6
Capacitance
100nF
C3
Capacitance
1uF
D5
C2
Capacitance
0.1uF
J2
J4
C1
Capacitance
10uF
J5
PS1

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    presence-sensing-esp32-c3

    presence-sensing-esp32-c3 thumbnail
    A presence sensing device powered by a mean well AC DC converter with a ESP32 C3 for it's brain plus a ld2410 mmwave module. the relay can be used to switch mains power. the ld2410 is connected through the terminal connectors.

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