The Hall effect sensor module is used to detect the proximity of magnets. It's much smaller. When the magnetic field exceeds the threshold, the open collector output transistor turns on, the logic compatible output goes low, and the onboard LED indicator lights up.
high speed (turn-on threshold 35450 gauss, minimum hysteresis 20 gauss, operating voltage range 4.5-24 volts. This module uses the Allegro MicroSystems A3144EUA sensor. 3-pin interface, signal, V +, and GND. I have.
For setting up wireless serial communication, the HC05 Bluetooth module is the most sophisticated and popular due to its low price and very high functionality.
This module can be used in master mode or slave mode, and you can easily switch between these two modes. Slave mode is set by default.
The mode can be changed with the AT command.
HC-05 Specifications:
- Profiles: Bluetooth serial port Profile
- 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
- Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
- Security: Authentication and encryption
- Power supply: +3.3VDC 50mA
- Working temperature: -20 ~ +75Centigrade
- Dimension: 26.9mm x 13mm x 2.2 mm
HC-05 Applications:
- Embedded Projects
- Industrial Applications
- Computer and portable Devices
- GPS receiver
