The **ENC1J-B16-R00064L** is a high-quality optical incremental encoder manufactured by **Bourns**. It is part of the EN series, designed for applications requiring high reliability and long cycle life where traditional mechanical contact encoders might fail. --- ## 1. Technical Specifications | Parameter | Specification | |:---|:---| | **Manufacturer** | Bourns | | **Encoder Type** | Optical Incremental | | **Output Type** | Quadrature (2-bit) | | **Pulses Per Revolution (PPR)** | 64 | | **Power Supply (VCC)** | 5.0 VDC ±5% | | **Supply Current** | 26 mA (Maximum) | | **Mounting Type** | Panel Mount (Bushings) | | **Termination Style** | Radial PC Pins | | **Rotational Life** | Up to 10,000,000 cycles | | **Shaft Diameter** | 1/4" (6.35mm) | --- ## 2. Key Components and Features ### A. Optical Sensing Technology Unlike mechanical encoders that use metal brushes, the ENC1J uses an internal LED and a phototransistor array. A slotted disk rotates between them, breaking the light beam to create pulses. * **Advantage:** No "contact bounce," meaning cleaner signals and a significantly longer lifespan. ### B. Quadrature Output The device outputs two signals (Channel A and Channel B) shifted 90 degrees out of phase. * **Direction Sensing:** By checking which channel leads (A before B or B before A), the microcontroller determines if the knob is turning clockwise or counter-clockwise. * **Resolution:** 64 PPR translates to 256 states per revolution if decoded using X4 logic. ### C. Construction * **B16:** Refers to the physical housing and bushing dimensions (typically a 1/4" diameter bushing). * **R00064L:** Indicates the resolution (64 pulses) and that it is RoHS compliant (**L**). --- ## 3. Typical Wiring Pinout | Pin Number | Function | Description | |:---|:---|:---| | **1** | B | Channel B Output | | **2** | 5V | Power Supply Input | | **3** | GND | Ground | | **4** | A | Channel A Output | --- ## 4. Application Logic (Example) When interfacing this part with an Arduino or Microcontroller, you typically use an interrupt-driven approach to ensure no pulses are missed. ```cpp // Basic Arduino Logic for ENC1J const int pinA = 2; // Channel A const int pinB = 3; // Channel B volatile int position = 0; void setup() { pinMode(pinA, INPUT); pinMode(pinB, INPUT); attachInterrupt(digitalPinToInterrupt(pinA), updateEncoder, RISING); } void updateEncoder() { if (digitalRead(pinB) == LOW) { position++; } else { position--; } } ```