Schematic for ESP32 RS485 Interface Module: This project is a...

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How can I connect this to the 12V line to show when the 12V is present

ekalan

@copilot How can I connect this to the 12V line to show when the 12V is present

10mo

copilot

To indicate when the 12V line (designator VCC12V) is present, you can use an LED with a current-limiting resistor. Here's how you can do it:

Connection Steps:

Choose an LED: If you don't have an LED in your project already, you might consider adding one. Since you have a place for a power indication with the designator PWR, you can use it for this purpose.
Current-Limiting Resistor Calculation:
- Assume a typical LED forward voltage of 2V and forward current of 20mA.
- The resistor value can be calculated using Ohm's Law:
  
  $R = \frac{{V_{\text{source}} - V_{\text{LED}}}}{I_{\text{LED}}}$
- For a 12V source: $R = \frac{{12V - 2V}}{0.020A} = 500\Omega$
- You can use a standard resistor value of 470Ω or 560Ω.
Connections:
- Connect VCC12V to the anode (A) of the PWR LED.
- Connect the cathode (K) of the PWR LED to one end of a resistor. For this example, let's use a 560Ω resistor, assuming designator R10.
- Connect the other end of R10 to GND.

Summary:

Connect VCC12V to PWR:A.
Connect PWR:K to R10:1.
Connect R10:2 to GND:1.

This setup will light the LED whenever the 12V is present, providing a visual indication. Let me know if you have any specific LEDs or resistor values in mind!

10mo

ESP_RX

GPIO23

GPIO2

GPIO13

ESP_TX

GND

ESP_TX

GPIO35

+3V3

C11

Capacitance

0.1u F

GPIO26

GPIO34

RS485_B

+5V

GPIO27

Resistance

10 Ω

GPIO25

ESP_EN

ESP_RX

RST

Resistance

10 Ω

GPIO5

RS485_A

GPIO33

GPIO32

ESP_IO0

GPIO12

GPIO36

+3V3

GPIO25

TERM

GPIO16

GPIO0

Resistance

10 Ω

GPIO12

GPIO15

C10

Capacitance

0.1u F

GPIO33

IC3

GPIO36

GPIO32

GPIO15

ESP_EN

GPIO13

GPIO16

GPIO21

GPIO22

GPIO2

GND

GPIO26

GPIO39

GPIO14

GPIO17

+5V

ESP_EN

GPIO14

GPIO21

BOOT

GPIO23

ESP_IO0

GPIO27

GPIO5

GPIO39

GPIO22

GPIO17

GPIO35

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper

Reports copper elements that are shorting.

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides • 34

	Designator	Ruleset
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊

Airwires • 99

	Designators	Net
	C2:P2, R9:P1	GND
	C3:P2, C1:P2	GND
	C3:P2, PWR:K	GND
	C4:P2, C6:P2	GND
	C4:P2, C8:P2	GND
	C5:P2, C10:P2	GND
	C7:P2, IC1:GND	GND
	C8:P2, C1:P2	GND
	C9:P2, C5:P2	GND
	C9:P2, R9:P1	GND
	C11:P2, C12:P2	GND
	C11:P2, R11:P1	GND
	D2:GND, USB1:GND	GND
	GND:GND, BOOT:P2	GND
	GND:GND, C10:P2	GND
	GND:GND, GND:GND	GND
	GND:GND, U1:GND	GND
	IC3:GND, C12:P2	GND
	IC3:GND, D3:common	GND
	IC3:GND, R9:P1	GND
	J1:6, J1:8	GND
	R10:P1, C1:P2	GND
	R10:P1, R11:P1	GND
	R11:P1, IC1:GND	GND
	U2:GND, J1:6	GND
	U3:GND, C7:P2	GND
	R2:P2, USB1:CC1	Net 1
	Q1:G, IC1:～DTR	Net 2
	Q1:G, Q2:S	Net 2
	+3V3:+3V3, U1:VOUT	Net 3
	+3V3:+3V3, U2:VDD	Net 3
	C2:P1, C1:P1	Net 3
	C2:P1, R8:P1	Net 3
	C3:P1, C1:P1	Net 3
	C3:P1, R4:P2	Net 3
	C4:P1, C6:P1	Net 3
	C4:P1, C8:P1	Net 3
	C6:P1, R4:P2	Net 3
	IC1:V3, IC1:VCC	Net 3
	IC3:VCC, C12:P1	Net 3
	IC3:VCC, R8:P1	Net 3
	R1:P2, C2:P1	Net 3
	R1:P2, IC1:VCC	Net 3
	U1:TAB(VOUT), R8:P1	Net 3
	U1:VOUT, U1:TAB(VOUT)	Net 3
	Q1:S, IC1:～RTS	Net 5
	Q1:S, Q2:G	Net 5
	ESP_EN:ESP_EN, RST:P1	Net 6
	R1:P1, C11:P1	Net 6
	R1:P1, Q1:D	Net 6
	U2:EN, Q1:D	Net 6
	U2:TXD0/IO1, IC1:RXD	Net 11
	U2:RXD0/IO3, IC1:TXD	Net 12
	USB1:CC2, R3:P2	Net 14
	D1:A, USB1:VBUS	Net 15
	D2:VDD, USB1:VBUS	Net 15
	USB1:VBUS, USB1:VBUS	Net 15
	PWR:A, R4:P1	Net 16
	+5V:+5V, C5:P1	Net 27
	+5V:+5V, U1:VIN	Net 27
	C7:P1, D4:K	Net 27
	C9:P1, C5:P1	Net 27
	D1:K, C9:P1	Net 27
	D1:K, D4:K	Net 27
	J1:4, J1:7	Net 33
	J1:7, C13:P1	Net 33
	C10:P1, BOOT:P1	Net 34
	C10:P1, Q2:D	Net 34
	GPIO0:GPIO0, BOOT:P1	Net 34
	R5:P2, IC3:B	Net 36
	R6:P2, IC3:A	Net 37
	D2:IO1, D2:IO1	Net 38
	D2:IO1, USB1:DP2	Net 38
	USB1:DP1, IC1:UD+	Net 38
	USB1:DP2, USB1:DP1	Net 38
	D2:IO2, D2:IO2	Net 39
	D2:IO2, IC1:UD-	Net 39
	D2:IO2, USB1:DN2	Net 39
	USB1:DN1, USB1:DN2	Net 39
	J1:1, TERM:P1	Net 40
	R6:P1, D3:A2	Net 40
	R6:P1, TERM:P1	Net 40
	R5:P1, D3:A1	Net 41
	R5:P1, J1:2	Net 41
	R5:P1, R7:P1	Net 41
	TERM:P2, R7:P2	Net 42
	J1:Anode_2, IC3:DI	Net 43
	J1:Anode_2, U2:IO19	Net 43
	IC3:DE, IC3:～RE	Net 44
	IC3:DE, R9:P2	Net 44
	U2:IO4, R9:P2	Net 44
	IC3:RO, R8:P2	Net 45
	J1:Anode_1, R8:P2	Net 45
	J1:Anode_1, U2:IO18	Net 45
	J1:Cathode_1, R11:P2	Net 46
	J1:Cathode_2, R10:P2	Net 47
	U3:OUT, D4:A	Net 48
	U3:OUT, U3:OUT	Net 48
	U3:IN, C13:P2	Net 49

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number • 23

	Designator	MPN
	C1	None
	C2	None
	C3	None
	C4	None
	C5	None
	C6	None
	C7	None
	C8	None
	C9	None
	C10	None
	C11	None
	C12	None
	C13	None
	PWR	None
	R1	None
	R2	None
	R3	None
	R4	None
	R5	None
	R6	None
	R7	None
	R8	None
	R9	None

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Passive Components

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Capacitor Voltage Rating

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Ground
A common return path for electric current. Commonly known as ground.
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43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
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A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
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An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
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1.2M
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1.2M
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Inspect

ESP32 RS485 Interface Module

Controls

Properties

License

https://creativecommons.org/licenses/by/4.0/

Availability & Pricing

Distributor		Qty 1
	Arrow	$5.13–$6.03
	Digi-Key	$12.78–$23.34
	LCSC	$7.02–$7.81
	Mouser	$12.63
	Verical	$6.30–$7.52

Assets

Thumbnail

ESP32 RS485 (Modbus) Controller Module-removebg-preview.png

id=ESP32 RS485 (Modbus) Controller Module-removebg-preview

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