Circuit Documentation
Summary of the Circuit
This circuit appears to be designed for distance measurement and indication purposes. It includes an HC-SR04 Ultrasonic Sensor for distance measurement, two LEDs (one red and one green) for visual indication, and a pair of resistors likely used for current limiting to the LEDs. A GPIO Expander is used to interface these components with a microcontroller or other digital system, although the specific microcontroller code is not provided in the input.
Component List
LED: Two Pin (red)
- Description: A red LED used for visual indication.
- Pins: cathode, anode
LED: Two Pin (green)
- Description: A green LED used for visual indication.
- Pins: cathode, anode
HC-SR04 Ultrasonic Sensor
- Description: An ultrasonic distance sensor that measures the range to an object by using ultrasonic waves.
- Pins: VCC, TRIG, ECHO, GND
Resistor (220 Ohms)
- Description: A resistor with a resistance of 220 Ohms, likely used for current limiting to the LEDs.
- Pins: pin1, pin2
GPIO Expander
- Description: An interface component that expands the number of GPIOs available for use by a microcontroller or other digital system.
- Pins: 5v, GND, 5V, TXD, RXD, GPIO18, GPIO23, GPIO24, GPIO25, CE0, CE1, EEC, GPIO12, GPIO16, GPIO20, GPIO21, GPIO26, GPIO19, GPIO13, GPIO6, GPIO5, EED, SCLK, MISO, MOSI, 3V3, GPIO22, GPIO27, GPIO17, GPIO4, SCL, SDA
Wiring Details
HC-SR04 Ultrasonic Sensor
- VCC connected to GPIO Expander 5V
- TRIG connected to GPIO Expander GPIO20
- ECHO connected to GPIO Expander GPIO16
- GND connected to common ground net with Resistors and GPIO Expander
LED: Two Pin (red)
- Anode connected to GPIO Expander GPIO5
- Cathode connected to one end of a 220 Ohm Resistor
LED: Two Pin (green)
- Anode connected to GPIO Expander GPIO6
- Cathode connected to one end of a 220 Ohm Resistor
Resistor (220 Ohms)
- One end connected to the cathode of the red LED
- Other end connected to common ground net
Resistor (220 Ohms)
- One end connected to the cathode of the green LED
- Other end connected to common ground net
GPIO Expander
- GND connected to common ground net with HC-SR04 Ultrasonic Sensor and Resistors
- 5V connected to HC-SR04 Ultrasonic Sensor VCC
- GPIO5 connected to the anode of the red LED
- GPIO6 connected to the anode of the green LED
- GPIO16 connected to HC-SR04 Ultrasonic Sensor ECHO
- GPIO20 connected to HC-SR04 Ultrasonic Sensor TRIG
Documented Code
No code was provided for the microcontroller(s) in the circuit. Therefore, this section is not applicable for the current documentation.