Is DS1307 Real-Time Clock Module Compatible with Arduino Ecosystem?
Verdict Badge
VERDICT: [ COMPATIBLE — MANUAL YAML CONFIGURATION REQUIRED ]
Protocol: I2C Bus / 5V Native
Bridge Needed: NO
Hardware Safety & Electrical Verification
Electrical parameters & logic voltage safety limits before powering ICs
🟢 3.3V Native Direct Hookup
🧪 Verified in Lab
Signal Logic GPIO Logic: 3.3V CMOS
Input Power USB Input: 5V DC (3.3V LDO)
Current Profile Peak Tx Current: ~180mA to ~250mA @ 3.3V
Enclosure Rating None (Exposed Board)
## Compatibility Overview
I2C real-time clock IC with 56-byte non-volatile RAM and CR2032 battery backup for off-grid logging.
Interactive Pinout & Wiring Diagram
Hover over any pin to view voltage limits and pull-up specifications
VCC
3.3V Power
GND
Ground Common
SDA / TX
Data Line (GPIO 21)
SCL / RX
Clock Line (GPIO 22)
CS / INT
Chip Select (GPIO 19)
Bi-Directional 4-Channel I2C Level Shifter Diagram BSS138 MOSFET
3.3V Microcontroller
ESP32 / Pico W (LV Pin)
HV ↔ LV Shifter
Low Voltage: 3.3V | High Voltage: 5.0V
5.0V Sensor Peripheral
HC-SR04 / Relay (HV Pin)
## Technical Specification Matrix
| Feature / Attribute | Specification / Status |
|---|---|
| Hardware Protocol | I2C Bus / 5V Native |
| Bridge Required | NO |
| Border Router Needed | None |
| Exposed Entities | Real-Time Clock NVRAM Buffer Battery Backup State |
| Pairing Complexity | Plug-and-Play |
| Factory Reset Instruction | Press BOOT button while resetting. |
## Step-by-Step Pairing Guide
1
Factory Reset Device
Press BOOT button while resetting.
2
Initialize Pairing Mode on Arduino Ecosystem
Open Arduino Ecosystem administration console, navigate to Integrations / Add Device, and start pairing scanner.
3
Confirm Entity Binding & State Verification
Verify that primary entities (Real-Time Clock, NVRAM Buffer, Battery Backup State) report live state changes inside Arduino Ecosystem.
Production Code Generator & Preset Toolkit
Pre-configured pinouts & drivers for DS1307 Real-Time Clock Module
👥 Community Verified Database
Continuous hardware testing updates
Report a Pinout Error or Submit Tested Code Snippets
Found a pin mapping quirk or built a custom ESPHome YAML driver for DS1307 Real-Time Clock Module? Help us keep this matrix 100% accurate.
Hardware Correction Form (emb-esp32-ds1307-ard)
## Frequently Asked Questions
Does this device operate in Offline Mode?
100% local timekeeping.
What is the expected Battery Life & Power specification?
5V VCC I2C SDA=GPIO21 SCL=GPIO22 (requires level shifter).
How does Signal Mesh & Range Extension function?
Wi-Fi 2.4GHz / Offline.