Build Guideintermediate

TinkerRTK Cellular NTRIP with SIM7000

Arduino sketches for using TinkerNav with the TinkerSend Mobile SIM7000 4G module to download RTK corrections from an NTRIP caster over cellular, enabling rover operation in remote areas without WiFi.

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Boards:ESP32-S3RP2040

Firmware:Arduino

Use Cases:GPS TrackingCellular IoT

GitHub

Overview

This project enables RTK positioning in remote locations by using a 4G cellular connection to download RTCM correction data from an NTRIP caster. The TinkerSend Mobile module (based on the SIMCom SIM7000G) provides LTE connectivity for the TinkerNav board, eliminating the need for WiFi infrastructure.

Key Features

Cellular Connectivity: Uses SIM7000G 4G LTE module for internet access anywhere with cell coverage
Remote Operation: Ideal for field surveying, agriculture, and outdoor robotics far from WiFi
NTRIP Integration: Downloads correction data from standard NTRIP casters
AT Command Library: Includes the AT_NTRIP library for managing SIM7000 communication
Battery Powered: Combine with TinkerCharge for solar-powered field deployment

Hardware Required

1x TinkerNav RTK GNSS base board
1x TinkerSend Mobile (SIM7000G) module
1x GNSS antenna (multi-band)
1x cellular antenna
SIM card with active data plan
USB-C cable for programming
Optional: TinkerCharge + LiPo battery + solar panel

Use Cases

Agricultural precision guidance systems
Remote land surveying
Autonomous vehicle navigation in rural areas
Construction site positioning

Getting Started

Insert a SIM card with data into the TinkerSend Mobile module
Connect TinkerSend Mobile to TinkerNav via the expansion headers
Download and configure the SIM7000 NTRIP sketches from GitHub
Set NTRIP caster credentials and APN settings
Flash to TinkerNav and deploy

Resources

GitHub Repository

Source code & project files

Devices Used in This Project

TinkerNav RTK GNSS Board

GNSS Receiver

Open-source RTK GNSS board with SkyTraq PX1105R receiver and ESP32-S3 for centimeter-level positioning. Works as base station or rover with WiFi, Bluetooth LE, and optional LoRa connectivity.

ESP32-S3512KB SRAM16MBWiFi 802.11 b/g/nBLE BLE 5.0

Gps Tracking iot

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Compatible Devices

LILYGO T-Display S3 AMOLED 1.64

ESP32 S3

ESP32-S3 development board with a 1.64" ICNA3311 AMOLED display at 280×456 resolution, 16MB Flash, 8MB PSRAM, Wi-Fi and Bluetooth 5 LE connectivity.

ESP32-S3R816MBWiFi 802.11 b/g/n 2.4 GHzBLE BLE 5.0

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LILYGO T-Display S3 AMOLED Plus

ESP32 S3

Enhanced ESP32-S3 AMOLED development board with 1.91" RM67162 display, onboard RTC, PMU, SD card slot, capacitive touch, metal shielding, and external FPC antenna.

ESP32-S3R816MBWiFi 802.11 b/g/n 2.4 GHzBLE BLE 5.0

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LILYGO T-Display AMOLED Lite

ESP32 S3

Compact ESP32-S3 development board featuring a 1.47" RM67162 AMOLED display with QSPI interface, 16MB Flash, 8MB PSRAM, Wi-Fi, Bluetooth 5, and battery charging support.

ESP32-S3R816MBWiFi 802.11 b/g/n 2.4 GHzBLE BLE 5.0

wearable Iot Sensor Display Smart Home Dashboard Portable Device prototyping

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LILYGO T-Keyboard S3 Pro

ESP32 S3

Advanced ESP32-S3 programmable keyboard board with 4 built-in 0.85" TFT displays, 14 RGB LEDs, rotary encoder, STM32 co-processor, magnetic connectors for daisy-chaining up to 6 units.

ESP32-S3R816MBWiFi 802.11 b/g/n 2.4 GHzBLE BLE 5.0

Macro Keyboard Hmi Panel Programmable Keyboard prototyping Home Automation

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LILYGO T-Display S3 Long

ESP32 S3

ESP32-S3 development board with an elongated 3.4" capacitive touch TFT LCD (180×640 resolution), 16MB Flash, 8MB PSRAM, Wi-Fi, Bluetooth 5, and optional enclosure variant.

ESP32-S3R816MBWiFi 802.11 b/g/n 2.4 GHzBLE Bluetooth 5.0 + Mesh

Iot Sensor Display Smart Home Dashboard Hmi Panel prototyping Data Logging

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LILYGO T-Mini E-Paper S3

ESP32 S3

LILYGO T-Mini E-Paper S3 is a compact ESP32-S3 board with a 1.02-inch 128×80 e-paper display, 4MB flash, 2MB PSRAM, WiFi, BLE 5, TF card slot, and support for 18350 battery. Available in 868MHz and 915MHz variants.

Xtensa LX7 dual-core @ 240MHz512KB SRAM4MBWiFi 802.11 b/g/nBLE BLE 5.0

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