The US-100 measures distance using reflected ultrasonic waves. The source describes temperature compensation, pulse-width output and serial UART output. It states that the module can operate from 2.4\u20135.5 V and has an idle current below 2 mA.<\/p>\n
Connect VCC and GND to a 2.4\u20135.5 V supply. Select the mode using the jumper on the back: with the jumper installed, the module returns binary serial data; with it removed, the module outputs a pulse whose width represents distance.<\/p>\n
Install the jumper. Connect Trig\/TX to the microcontroller TX line and Echo\/RX to RX. Configure serial communication for 9600 baud, 8 data bits, no parity and 1 stop bit (8-N-1). Send byte Remove the jumper. Connect Trig\/TX to a microcontroller output and Echo\/RX to an input. Hold Trig\/TX high for at least 50 \u00b5s, then set it low to trigger a measurement. Measure the high pulse width on Echo\/RX. The source gives this calculation: Listed applications include robotic obstacle avoidance, presence detection, distance measurement and monitoring, and industrial object detection.<\/p>\n Components: US-100, Arduino Uno, jumper wires and breadboard. The following source code uses trigger\/echo pulse mode:<\/p>\n Components: US-100, Arduino Uno, I2C 1602 LCD, jumper wires and breadboard.<\/p>\n The example uses The source\u2019s Arduino sketches demonstrate pulse mode, not the UART protocol. Check the jumper position, wiring and controller logic-voltage limits before use. Ultrasonic readings vary with target shape, surface, angle and environment; do not treat the stated range or accuracy as guaranteed for every target.<\/p>\n","protected":false},"excerpt":{"rendered":" US-100 ultrasonic distance module with pulse-width and UART output modes. Source-listed range: 2\u2013450 cm; supply: 2.4\u20135.5 V.<\/p>\n","protected":false},"featured_media":58530,"template":"","meta":[],"product_brand":[],"product_cat":[314,316],"product_tag":[],"class_list":["post-58529","product","type-product","status-publish","has-post-thumbnail","product_cat-developpement-en","product_cat-modules-capteurs-en","first","instock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\n0x55<\/code> and read two bytes, high byte first. Calculate distance in millimetres as first byte \u00d7 256 + second byte<\/code>. For the source-listed temperature reading, send 0x50<\/code> and read one byte; calculate \u00b0C as byte \u2212 45<\/code>.<\/p>\nPulse-width mode<\/h5>\n
millimetres = pulse width \u00d7 34 \/ 100 \/ 2<\/code>.<\/p>\nSpecifications stated by the source<\/h4>\n
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Arduino Uno pulse-mode example<\/h4>\n
#define TRIG_PIN 2\r\n#define ECHO_PIN 3\r\nlong duration;\r\nint distance;\r\n\r\nvoid setup() {\r\npinMode(TRIG_PIN, OUTPUT);\r\npinMode(ECHO_PIN, INPUT);\r\nSerial.begin(9600);\r\n}\r\n\r\nvoid loop() {\r\ndigitalWrite(TRIG_PIN, LOW);\r\ndelayMicroseconds(2);\r\ndigitalWrite(TRIG_PIN, HIGH);\r\ndelayMicroseconds(10);\r\ndigitalWrite(TRIG_PIN, LOW);\r\nduration = pulseIn(ECHO_PIN, HIGH);\r\ndistance = duration \/ 29 \/ 2;\r\nSerial.print(\"Distance: \");\r\nSerial.print(distance);\r\nSerial.println(\" cm\");\r\ndelay(1000);\r\n}<\/code><\/pre>\n<\/div>\nBasic code and wiring<\/h4>\n
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pulseIn()<\/code> measures the echo duration.<\/li>\n\n
Arduino Uno example with I2C 1602 LCD<\/h4>\n
#include <Wire.h>\r\n#include <LiquidCrystal_I2C.h>\r\n\r\n\r\n#define TRIG_PIN 2\r\n#define ECHO_PIN 3\r\nlong duration;\r\nint distance;\r\n\r\n\r\nLiquidCrystal_I2C lcd(0x27, 16, 2);\r\n\r\n\r\nvoid setup() {\r\n\u00a0 pinMode(TRIG_PIN, OUTPUT);\r\n\u00a0 pinMode(ECHO_PIN, INPUT);\r\n\u00a0 lcd.begin();\r\n\u00a0 lcd.backlight();\r\n\u00a0 Serial.begin(9600);\r\n}\r\n\r\n\r\nvoid loop() {\r\n\u00a0 digitalWrite(TRIG_PIN, LOW);\r\n\u00a0 delayMicroseconds(2);\r\n\u00a0 digitalWrite(TRIG_PIN, HIGH);\r\n\u00a0 delayMicroseconds(10);\r\n\u00a0 digitalWrite(TRIG_PIN, LOW);\r\n\u00a0 duration = pulseIn(ECHO_PIN, HIGH);\r\n\u00a0 distance = duration \/ 29 \/ 2;\r\n\u00a0 lcd.setCursor(0, 0);\r\n\u00a0 lcd.print(\"Distance: \");\r\n\u00a0 lcd.print(distance);\r\n\u00a0 lcd.print(\" cm\");\r\n\u00a0 Serial.print(\"Distance: \");\r\n\u00a0 Serial.print(distance);\r\n\u00a0 Serial.println(\" cm\");\r\n\u00a0 delay(1000);\r\n}<\/code><\/pre>\n<\/div>\nWire<\/code> and LiquidCrystal_I2C<\/code>, measures distance in the main loop and displays the result on the LCD and serial monitor. Wire Trig to pin 2, Echo to pin 3, VCC to 5V and GND to GND; connect LCD SDA to A4 and SCL to A5 on Arduino Uno.<\/p>\nInstall the LCD library<\/h4>\n
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Comparison with HC-SR04 (figures from the source)<\/h4>\n
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