Type: Raspberry 4B Aluminum Alloy Metal Case Material: Black Aluminum Alloy Metal Compatible For：Raspberry PI 4 Easy to install, Ultra-thin design. Open case design with Daul Fans for Fast Heat dissipation. Weight: 110gm
The MAX485 TTL to RS485 Module converts standard TTL serial signals (UART) from microcontrollers into differential RS485 signals for long-distance, high-noise industrial communication. Featuring a low-power MAX485 chip, onboard 5.08mm screw terminals, and 5V operation, it allows seamless multipoint networking and Modbus RTU communication up to 1200 meters with Arduino, Raspberry Pi, and PLCs.
Supply Voltage : 8-35 VDC. Current : 1.0A  (no heatsink ). Current : 2.0A (with heat-sinking). logic input : 3 – 5.5V . Automatic current decay mode detection / choice. Mixed with slow current decay mode.
Working Voltage: 5 to 18V DC (min tested working voltage 4.5V). Max current draw: 15mA @ 5V. Working Flow Rate: 1 to 30 Liters/Minute. Maximum water pressure: 2.0 MPa. Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min).
5V 4-Channel Relay interface board and each one needs 15-20mA Driver Current. Equipped with high-current relay, AC250V 10A; DC30V 10A. Standard interface that can be controlled directly by microcontroller (for Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic). Indication LED’s for Relay output status.
Input Voltage: DC3.6V-6V Input Current: 2A-5A Output Voltage: DC 400KV (Please pay attention to safety when used) Input Line Length: about 100mm (red is positive) Output Line Length: about 160mm
Bluetooth protocol: Bluetooth Specification v2.0+EDR. Frequency: 2.4GHz ISM band. Modulation: GFSK(Gaussian Frequency Shift Keying). Emission power: =4dBm, Class 2. Sensitivity: =-84dBm at 0.1% BER. UART interface and with baud rate setup function
