Finding LCD 16x2 Module

Thought for 25 sec

flux

Added 1x 2N2222A as Q1
Added 1x 1N4001 - 8363396 as D8
Added 1x Generic Resistor as R1

gabugraver41

now connect all of them together

Thought for 2 mins 59 sec

flux

Here are the net connections for the relay driver circuit:

Table

Net	Connections
RELAY_CTRL	U1:GPIO4, R1:1, Q1:Base
RELAY_COIL+	K1:Coil+, D8:Cathode
RELAY_COIL-	K1:Coil–, Q1:Collector, D8:Anode
GND	U1:GND, Q1:Emitter

Let me know if you’d like to apply these changes.

Thought for 40 sec

flux

Connected U1:D4 to R1:P1
Connected R1:P1 to Q1:B
Connected K1:Coil-1 to D8:K
Connected K1:Coil-2 to Q1:C
Connected Q1:C to D8:A
Connected U1:GND to Q1:E

U3 P4 - LCD1 RS

U3 P5 - LCD1 R/W

U3 P0 - LCD1 D4

U3 P4 - LCD1 RS

U1 TX2 - U2 RXD

U1 GND - U3 VSS

U1 D21 - U4 SDA

U1 3V3 - U3 VDD

U1 GND - U3 VSS

U1 D22 U4 SCL - U3 SCL

U1 3V3 - U4 VCC

U1 GND - U3 VSS

U3 P3 - LCD1 D7

U1 D22 - U3 SCL

U1 TX2 - U2 RXD

U3 P6 - LCD1 E

U1 GND - U3 VSS

U3 P6 - LCD1 E

U3 P5 - LCD1 R/W

U1 3V3 - U3 VDD

U1 D21 - U3 SDA

U1 D4 - R1 P1

U3 P2 - LCD1 D6

K1 Coil-2 - Q1 C

U1 GND - U3 VSS

U1 3V3 - U3 VDD

U1 D22 U3 SCL-U4 SCL

U3 P7 - LCD1 LED(+)

U1 D4 - R1 P1

U1 3V3 - U3 VDD U4 VCC

K1 Coil-1 - D8 K

U1 D21 - U4 SDA

U3 P3 - LCD1 D7

U1 3V3 - U3 VDD

K1 Coil-2 - Q1 C

U3 P7 - LCD1 LED(+)

U3 P1 - LCD1 D5

K1 Coil-1 - D8 K

U1 GND - U3 VSS

U1 D21 - U3 SDA

U3 P1 - LCD1 D5

U1 GND - U3 VSS

U1 RX2 - U2 TXD

U1 3V3 - U4 VCC

U1 D4 - R1 P1

U1 RX2 - U2 TXD

U3 P0 - LCD1 D4

sublayout1

LCD1

Resistance

500 Ω

Not Recommended for New Designs

/* 
 * STM32 Water Flow Meter with 16x2 I2C LCD
 * YF-S201 Hall Effect Water Flow Sensor
 * Coded and Tested By: Sheekar Banerjee, AI-ML-IOT Solution Engineer and Researcher
 * Adapted for STM32F031C6/STM32L072 with LCD by Grok
 * Displays water flow in litres/hour on LCD and UART
 */
#include "main.h"
#include "stm32l0xx_hal.h" // Use stm32f0xx_hal.h for STM32F031C6 in Wokwi
#include < string.h >
    #include < stdio.h >
    // UART and I2C handles
    UART_HandleTypeDef huart2;
I2C_HandleTypeDef hi2c1;
// LCD I2C address (PCF8574, typically 0x27 or 0x3F, left-shifted for HAL)
#define LCD_ADDR(0x27 << 1)
// LCD commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02

Reviews

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Project Name

smart water meter

Description

Welcome to your new project. Imagine what you can build here.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$1.98–$5.68
Digi-Key	$2.09–$6.30
LCSC	$10.43–$11.57
Mouser	$2.96–$5.67
TME	$3.97–$4.67
Verical	$1.65–$8.27

Controls

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