3.6/3.7V Dual 18650 Rechargeable Lithium Battery Charger
sim7670c ic is good but it booting is very complication any other metod to connect 4G pius sms read and write
2A Dual L298N Motor Driver Module with PWM Control
Hall Effect Sensor Module
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Hall Effect Sensor Module is used to detect the proximity of a magnet. It is very much smaller in size. When the magnetic field rises above a threshold level, the open-collector output transistor switches on, which pulls the logic-compatible output low and illuminates the onboard LED indicator.
It's fast (The turn-on threshold is 35-450 Gauss, the minimum hysteresis is 20 Gauss, and the operating voltage range is 4.5 - 24 volts. This module uses the Allegro MicroSystems A3144EUA sensor. It has a 3-pin interface, signal, V+, and GND.
To use this sensor/switch, place a 10K pull-up resistor between the "S" pin and the middle pin (+), and connect the "-" pin to the ground. Supply voltage to the middle pin. The "S" pin will go low (gets pulled to the ground) and the onboard LED indicator will turn on when a magnet is brought near.
| Sensor Type | Hall Effect Sensor Module |
| Power | 2.3V ~ 5.3V |
| Mounting holes size | 2mm |
| Dimensions | 29.2mm * 11.2mm |
| Weight | 5 grams |