Neema ESP32 WiFi - Google Assistant Controlled Blinds

Control your window blinds with voice commands via Google Assistant! No potentiometer needed - just say "Ok Google, open the blinds" and watch them move.

Features

✅ Google Assistant voice control
✅ "Ok Google, open the blinds" (100% open)
✅ "Ok Google, close the blinds" (0% closed)
✅ "Ok Google, set blinds to 50%" (any percentage)
✅ Smooth acceleration/deceleration with AccelStepper
✅ WiFi connectivity (no physical controls needed)
✅ Remembers last position after power cycle
✅ Works from anywhere (phone, Google Home, Google Nest)

Hardware Requirements

Components

Arduino Nano ESP32-S3 (with WiFi)
Stepperonline 17HS19-2004S1 NEMA 17 stepper motor
Pololu DRV8825 stepper driver
12V battery or power supply
Jumper wires and breadboard

Wiring

⚠️ CRITICAL: ESP32-S3 uses 3.3V logic (NOT 5V!)

DRV8825 Control Pins:

STEP → ESP32 GPIO3 (D3)
DIR → ESP32 GPIO2 (D2)
ENABLE → ESP32 GPIO4 (D4)
SLEEP → Connect to RESET pin (or 3.3V)
RESET → Connect to SLEEP pin (or 3.3V)

Microstepping Configuration (1/32 mode):

M0 → ESP32 3.3V (NOT 5V!)
M1 → ESP32 3.3V (NOT 5V!)
M2 → ESP32 3.3V (NOT 5V!)

Power:

VMOT → 12V battery positive
GND → 12V battery negative AND ESP32 GND (common ground required!)
VDD → ESP32 3.3V (logic power)

Motor Connections:

A1, A2 → Motor coil A
B1, B2 → Motor coil B

ESP32 Power:

VIN → 12V (or use USB-C for development)
GND → Common ground with DRV8825

DRV8825 Current Limiting

MUST set current limit before use!

For 17HS19-2004S1 motor (2.0A rated):

Target current: 1.4A (70% of rating)
Vref setting: 0.7V
Formula: Vref = Current / 2

Use multimeter to measure voltage between trimpot wiper and GND, adjust to 0.6-0.7V.

Software Setup

1. Install Required Libraries

Using Arduino IDE:

Library Manager → Install "AccelStepper" by Mike McCauley
Library Manager → Install "SinricPro" by Boris Jaeger

Using Arduino CLI:

arduino-cli lib install AccelStepper
arduino-cli lib install "SinricPro"

2. Sinric Pro Account Setup (Already Done!)

Your device is already configured with:

Device Name: (check your Sinric Pro dashboard)
Device Type: Blinds
App Key: c831c095-xxxx (in code)
Device ID: 694f82666ebb39d664d5169d

3. Link Sinric Pro to Google Home

One-time setup:

Open Google Home app on your phone
Tap + (Add) → Set up device → Works with Google
Search for "Sinric Pro"
Tap Sinric Pro and sign in with your Sinric Pro account
Your blinds device will appear in Google Home!
Assign it to a room (e.g., "Bedroom")

Done! Now you can control it with voice.

4. Upload Code to ESP32

Using Arduino IDE:

Select Board: "Arduino Nano ESP32"
Select Port: /dev/ttyACM0 (or your port)
Click Upload

Using Arduino CLI:

arduino-cli compile --fqbn esp32:esp32:nano_nora neema_esp32_wifi.ino
arduino-cli upload -p /dev/ttyACM0 --fqbn esp32:esp32:nano_nora neema_esp32_wifi.ino

Monitor Serial Output:

arduino-cli monitor -p /dev/ttyACM0 -c baudrate=115200

Usage

Voice Commands

Once setup is complete, try these commands:

Basic Control:

"Ok Google, open the blinds" → 100% open
"Ok Google, close the blinds" → 0% closed
"Ok Google, turn on the blinds" → Open
"Ok Google, turn off the blinds" → Close

Position Control:

"Ok Google, set blinds to 50%" → Half open
"Ok Google, set blinds to 25%" → Quarter open
"Ok Google, set blinds to 75%" → Three-quarters open

Relative Adjustments:

"Ok Google, increase blinds by 20%" → Move up 20%
"Ok Google, decrease blinds by 10%" → Move down 10%

Serial Monitor Output

When connected via USB, you'll see:

Neema ESP32 WiFi - Google Assistant Blinds Control
==================================================
Motor initialized
Steps per revolution: 6400
Rotation range: 3200 steps (180 degrees)
Connecting to WiFi...
Connected! IP address: 192.168.x.x
Sinric Pro connected!
You can now control blinds with Google Assistant:
  'Ok Google, open the blinds'
  'Ok Google, close the blinds'
  'Ok Google, set blinds to 50%'

Setup complete! Listening for Google Assistant commands...
Google Assistant requested position: 50%
Moving to 1600 steps (50%)
✓ Movement complete! Position: 50% (1600 steps)

Configuration

Adjust Rotation Range

If your blinds need more or less rotation:

// In neema_esp32_wifi.ino:
const int ROTATION_RANGE = TOTAL_STEPS / 2;  // 180° (default)

// Options:
// TOTAL_STEPS / 4 = 90° rotation
// TOTAL_STEPS / 2 = 180° rotation (default)
// TOTAL_STEPS = 360° full rotation

Adjust Motor Speed

For faster or slower movement:

const int MAX_SPEED = 2000;        // Increase for faster (try 3000)
const int ACCELERATION = 1000;     // Increase for quicker starts (try 1500)

Change WiFi Network

Edit these lines in the code:

#define WIFI_SSID "Frontier2211_EXT"
#define WIFI_PASS "ChairNotebook8146"

Troubleshooting

WiFi Won't Connect

Check SSID and password in code
Ensure 2.4GHz WiFi (ESP32 doesn't support 5GHz)
Move ESP32 closer to router
Check serial monitor for error messages

Sinric Pro Not Connecting

Verify App Key, App Secret, and Device ID in code
Check internet connection
Ensure Sinric Pro account is active
Check serial monitor for connection errors

Google Assistant Not Finding Device

Make sure Sinric Pro is linked in Google Home app
Try saying "Ok Google, sync my devices"
Check that device appears in Google Home app first
Restart Google Home app

Motor Doesn't Move

Check DRV8825 current limit (Vref = 0.6-0.7V)
Verify common ground between ESP32 and DRV8825
Check that M0, M1, M2 are connected to 3.3V
Ensure SLEEP and RESET are tied together or to 3.3V
Check motor coil connections

Motor Moves Wrong Direction

Swap one motor coil pair (A1/A2 or B1/B2, not both)

Position Tracking Wrong

Motor might be skipping steps (lower MAX_SPEED)
Current limit too low (increase Vref slightly)
Check for mechanical binding

Security Notes

WiFi password is stored in code (plaintext)
For production, consider using WiFiManager for secure credential storage
Sinric Pro credentials stored in code (rotate if compromised)
Device is accessible from internet via Sinric Pro cloud

Future Enhancements

Potential improvements:

Technical Details

Board: Arduino Nano ESP32-S3 (esp32:esp32:nano_nora)
Flash Usage: ~400KB program storage
RAM Usage: ~50KB dynamic memory
WiFi: 2.4GHz 802.11 b/g/n
Cloud Service: Sinric Pro (free tier: 3 devices)
Communication: WebSocket over HTTPS
Latency: ~1-2 seconds from voice command to movement

License

This project is open source. Feel free to modify and use for your own projects.

Credits

Based on Neema ESP32 potentiometer-controlled blinds project
Uses SinricPro library for Google Assistant integration
AccelStepper library for smooth motor control

Author

Created for the Shed Computer Arduino projects collection.

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