User's Manual

Intellibox schematics work description
This product is used for supermarket entrance and exit. A 8.13KHz wireless
signal is transmitted to the shopping cart casters through the external LOOP line,
and the signals from different positions are transmitted to the shopping cart
casters, so that the shopping cart can move within the specified range, and the
wheels can be locked and stopped beyond the range, so as to achieve the safety
purpose.
Power supply part: 110VAC/220VAC is used, and 13VDC is output by
switching power supply (LRS-100-15) to supply power to Intellibox main board
and fan.
Intellibox display board is connected to the motherboard by a wiring
arrangement for power supply and signal transmission.
Intellibox main board part: MCU uses NRF52832, 32.768KHz and 32
MHz external crystal oscillators of NORDIC, working frequency is 64MHz.
The signal receiving circuit of 2.4 GHz is LC resonant circuit. The
external RF antenna receives 2.4 GHz wireless signal. When the lock signal is
received, the MCU drives the buzzer to alarm.
Three groups of waveform generators generate three 8.13KHz
sinusoidal signals, and three ON/OFF signals output by MCU are combined
with 8.13KHz signals (A/C/H) via MOS transistors. A/C/H signal is amplified
by power amplifier TDA7850, filtered by LC circuit and transmitted by
external LOOP line.