SC7A20H 3-Axis Sensor | Acceleration Tilt Angle Module

SC7A20H 3-Axis Sensor Module - Acceleration and Tilt Angle Output for Embedded Motion Detection

The SC7A20H 3-axis acceleration and tilt angle sensor module is designed for projects that need low-cost orientation, tilt, and motion detection without building the full signal-processing pipeline from scratch. The product page describes an integrated module with a three-axis acceleration sensor, onboard MCU processing, and serial output of angle values for direct use in embedded systems.

The sensor option, SKU TB-SCSensor, focuses on the SC7A20H acceleration sensor itself, while the same product page also includes a module variant. It is useful for tilt switches, leveling indicators, tamper detection, simple attitude readout, robot posture sensing, and low-power motion triggers. It can be evaluated with hosts such as the ELAB Nano V3, quick serial test fixtures, or a small embedded controller mounted in a product enclosure.

The current listing notes adjustable full-scale ranges of +/-2g, +/-4g, +/-8g, and +/-16g, 12-bit output, I2C/SPI sensor interfaces, low-power modes, interrupts for motion events, embedded FIFO, self-test, and strong shock resistance. The module-level page also describes 9600 baud serial control commands such as on, off, x, y, z, and zero for angle-output workflows.

Technical Specifications

Board Layout & Label Guide

• VCC - Power input for the sensor or module version; follow the selected variant voltage limits.
• GND - Common ground for the host system.
• TX - Module serial transmit line for angle data output.
• RX - Module serial receive line for commands such as on, off, x, y, z, and zero.
• SCL/SCK - Clock pin when using the SC7A20H sensor through I2C or SPI.
• SDA/SDI - Data pin for I2C or SPI sensor communication.
• INT1/INT2 - Interrupt outputs for motion, click, free-fall, or direction events.
• Mounting Direction - Fix the board firmly and define the zero position before interpreting tilt data.

Application Scenarios

1. Serial Angle Readout on Arduino

Read module angle data from a software serial port at 9600 baud.

#include <SoftwareSerial.h>

SoftwareSerial tiltSerial(10, 11);

void setup() {
  Serial.begin(115200);
  tiltSerial.begin(9600);
  tiltSerial.println("on");
}

void loop() {
  while (tiltSerial.available()) {
    Serial.write(tiltSerial.read());
  }
}

2. Zero Calibration Command

Send the zero command after the module is fixed in the desired reference position.

#include <SoftwareSerial.h>

SoftwareSerial tiltSerial(10, 11);

void setup() {
  tiltSerial.begin(9600);
  delay(500);
  tiltSerial.println("zero");
}

void loop() {
}

3. Select One Axis Output

Request only X-axis output to simplify parsing in a tilt-switch application.

#include <SoftwareSerial.h>

SoftwareSerial tiltSerial(10, 11);

void setup() {
  Serial.begin(115200);
  tiltSerial.begin(9600);
  tiltSerial.println("x");
}

void loop() {
  if (tiltSerial.available()) {
    Serial.write(tiltSerial.read());
  }
}

4. Python Serial Logger

Record module serial output on a PC for calibration and motion testing.

import serial
import time

port = serial.Serial("COM7", 9600, timeout=1)
port.write(b"on\r\n")

with open("sc7a20h_angle_log.txt", "a", encoding="utf-8") as log:
    while True:
        line = port.readline().decode(errors="ignore").strip()
        if line:
            log.write(f"{time.time():.0f},{line}\n")
            log.flush()
            print(line)

Packing List

• 1 x SC7A20H 3-Axis Acceleration and Tilt Angle Sensor Module, selected variant Sensor

FAQ

Q: What does TB-SCSensor refer to?
A: It is the Sensor variant on the SC7A20H 3-axis acceleration and tilt angle product page.

Q: What can the SC7A20H detect?
A: It detects 3-axis acceleration and can support tilt, direction, free-fall, click, and motion events.

Q: What is the module serial baud rate?
A: The current listing states 9600 baud, 8 data bits, 1 stop bit, and no parity.

Q: What commands are listed?
A: The page lists on, off, x, y, z, and zero commands.

Q: What acceleration ranges are supported?
A: The listed ranges are +/-2g, +/-4g, +/-8g, and +/-16g.

Q: Does the chip support I2C and SPI?
A: Yes, the listing describes I2C/SPI digital output interfaces at sensor level.

Q: Why should I send zero?
A: The zero command sets the current mounted position as the angle reference.

Q: What should I check if serial data is unreadable?
A: Check TX/RX crossing, common ground, baud rate, voltage levels, and whether output is enabled.