Elecrow's new ESP32 series screens are now on sale with discounts of up to 30% off! These screens feature a powerful ESP32 chip and come in a variety of sizes and resolutions to meet your needs. With built-in WiFi and Bluetooth, they are perfect for IoT projects. Take advantage of this limited-time offer and upgrade your projects with Elecrow's high-quality ESP32 screens today!

1️⃣ ESP32 2.4" HMI Touch Screen Compatible with Arduino/LVGL

2️⃣ ESP32 2.8" HMI Touch Screen Compatible with Arduino/LVGL

3️⃣ ESP32 3.5" HMI Touch Screen Compatible with Arduino/LVGL

4️⃣ ESP32 4.3" HMI Touch Screen Compatible with Arduino/LVGL

5️⃣ ESP32 5" HMI Touch Screen Compatible with Arduino/LVGL

6️⃣ ESP32 7" HMI Touch Screen Compatible with Arduino/LVGL

🚩 Let's learn more about Elecrow ESP HMI Display 👇

Below is the error i am seeing -

C:\Program Files (x86)\Letscode\arduino\hardware\arduino\avr\cores\arduino/main.cpp:46: undefined reference to `loop'

collect2.exe: error: ld returned 1 exit status

exit status 1

Pls let me know if you can point me in the right direction?? not sure i am doing anything wrong?

I will return the kit if it doesn't work.

1️⃣ Lab-On-The-Go - All-in-one circuit building kit

2️⃣ AS7331 UVA/B/C Light Sensor Breakout

3️⃣ EBUS to WiFi adapter module v5.2

4️⃣ 8 Digit SPI Seven Segment LED Display

5️⃣ DevDuino Development Platform

6️⃣ PIC for Dual Channel Inductive Loop Vehicle Detector

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1️⃣ QuadQuad2 4ch Quadrature Decoder

2️⃣ Button board that enables gesture recognition

3️⃣ Eurorack prototyping 4HP 5-hole Front Panel

4️⃣ 16x32 RGB LED matrix panel + Arduino driver shield

5️⃣ MEGO: Rechargeable 4-24V Portable Breadboard Power Supply

6️⃣ Digital MEMS Microphone

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This module uses RP2040 as the main controller and the RA-08H module provides LoRa transmission and reception functions. It supports LoRa point-to-point transparent transmission and LoRaWAN network. When combined with four types of Crowtail sensor modules (Ax2/Dx2/IICx1/UARTx1), it can quickly build a Lora node. Additionally, we provide two firmware versions for 868/915MHZ to meet different usage needs.

To facilitate outdoor use, this module has a built-in lithium battery charging and discharging circuit, and an interface that supports solar panel charging, making it easy to set up and use the node outdoors.

The module has six interfaces that can be used with commonly used sensors such as temperature and humidity, air quality, light, PM2.5, etc., providing convenience for quickly building a Lora weather station, as well as for projects related to smart homes, smart factories, and smart logistics. In addition, we have introduced a 20-pin header and added a double-row pin header in the accessories, which allows you to choose whether to solder it or not, supporting more development options. RA-08H supports programming in both Arduino and MicroPython, making it easy for users to achieve rapid and agile development.

Connect with Crowtail Sensors

It can be connected with 150+ types of Crowtail modules to complete more interesting projects.

Hardware Overview

Feature

• Uses RP2040 as the main controller, with two 32-bit ARM Cortex M0+ processor cores (dual-core), and provides more powerful performance
• Integrates the RA-08H module with 128KB Flash, 16KB SRAM, supports frequency band: 803MHZ-930MHZ
• Abundant external interface resources, compatible with 150+ kinds of Crowtail series modules
• Supports both Lora point-to-point transparent transmission and the use of LoraWAN network
• Compatible with Arduino/MicroPython, easy to carry out different projects

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1️⃣ TSYS01 Temperature Sensor Board

2️⃣ DEEJ Physical Volume Mixer Electronics Kit

3️⃣ Blank PCB for Dual Channel Inductive Loop Vehicle Detector (B)

4️⃣ Programmable relay timer switch

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🌿 Easy Pulse is a DIY pulse sensor that can be used for detecting the cardio-vascular pulse wave from a fingertip designed, which was designed by EmbeddedLab, PCBAssembly,sell and shipping by Elecrow.

⚡ It is designed for hobby and educational applications to illustrate the principle of photoplethysmography (PPG), which is a non-invasive optical technique of retrieving vital information about the cardiovascular system from the skin surface.

⚡ It uses an infrared light source to illuminate the finger on one side, and a photodetector placed on the other side measures the small variations in the transmitted light intensity. The variations in the photodetector signal are related to changes in blood volume inside the tissue.

⚡ The signal is filtered and amplified to obtain a nice and clean PPG waveform, which can be thus used to derive the instantaneous heart rate. The Easy Pulse sensor also provides a digital pulse output which is synchronous with the heart beat.

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This is a high-performance LTE Cat1 wireless module from the Crowtail series, featuring the SIM A7670E communication module from Simcom. It supports 4G data transmission and voice communication through a UART interface and is compatible with multiple LTE bands, including B1/B3/B5/B7/B8/B20, as well as WCDMA and GSM networks. The module also supports various protocols such as TCP/IP, FTP, HTTP, and multiple satellite navigation systems such as GPS, GLONASS, and BDS.

The module can be powered by a 3.7V lithium battery or a 5V type-C interface and has a charging interface. It also features a 3.5mm headphone jack, which can be used for making and receiving phone calls by connecting a headphone with a microphone. Its compact size makes it easy to integrate into IoT devices, and it is widely used in IoT, smart home, automotive, and industrial control fields due to its low power consumption and reliable performance.

When paired with the Crowtail base shield for Raspberry Pi or Arduino, it can quickly build 4G-related projects with these boards.

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