Sliding Gate

An ESP-WROOM-32 and arduino code to control a sliding gate with AC motor.

Software:

A C++ code that controls the different elements of a sliding gate, namely:

• a 220v AC motor with oil bath,
• 24v photobeams,
• 2 magnetic limit sensors.
• 2 engine torque limiters,
• 1 presence detector input,
• 1 RF remote control input,
• automatic closing after a programmable delay,
• control of the opening and closing times,
• a web interface,
• OTA code update.
• integrable into home automation tools (domoticz, jeedom, ...) via http interfaces.

interface board:

Screenshots:

Hardware:

The original microcontroller was an 18-pin PIC microcontroller (F745?) that froze from time to time ...

The remplacement part is an ESP-WROOM-32 :

• CPU: Xtensa dual-core 32-bit LX6 microprocessor, operating at 240 MHz and performing at up to 600 DMIPS
• 4MB SPI flash memory, support up to 16MB of flash memory,
• ultra low power (ULP) co-processor,
• Wi-Fi: 802.11 b/g/n (including WFA, WPA/WPA2 and WAPI),
• Bluetooth: v4.2 BR/EDR and BLE
• secure boot,
• Flash encryption,
• Cryptographic hardware acceleration: AES, SHA-2, RSA, elliptic curve cryptography (ECC), random number generator (RNG),
• multiple peripheral interfaces (see: https://en.wikipedia.org/wiki/ESP32)
• and a powerful power management, especially in embedded applications:
• internal low-dropout regulator,
• individual power domain for RTC,
• 5uA deep sleep current,
• wake up from GPIO interrupt, timer, ADC measurements, capacitive touch sensor interrupt

Problem: the PIC microcontroller support 5v on its I/O while the ESP only supports 3.3v. It will therefore be necessary to adapt the electrical levels: limit them on each input by a zener, upgrade outputs with transistor interfaces ...

TODO:

• periodic wake up for the states recovery,
• use FreeRTOS multitasking...
• ...

DETAILS:

Original part:

Replacement part:

Functional scheme:

Interface board:

Done: