OBJEX Link v1.6-C3 RISCV

Overview

OBJEX Link v1.6-C3 is the RISC-V version of the series. This version of OBJEX Link v1.6-C3 is based on the new ESP32-C3 which has a 32-bit single-core RISC-V processor. It's very useful for various IoT devices (wearables for example) and for applications that require higher power efficiency or other features such as Bluetooth 5.0, and WiFi 4.

IoT Applications: Wearable devices, Smart Home & Cities, IIOT, Predictive Maintenance, Agriculture Automation.

It's also ideal for rapid prototyping, advanced research projects, and robotics projects.

Key features

• Compact size 24x24mm, high component density

• Modular design for a wide range of applications

• Designed to ensure easy reuse

• Low power consumption with Ultra Deep Sleep mode

• Based on ESP32-C3 RISCV

• WiFi 4 & BLE 5.0 connectivity

• 22 programmable GPIOs

• USB-C Type 2.0

• Tiny battery connector

• Compatible with Arduino and MicroPython

• Battery manager(fast-charge)

• Support for external PSRAM

Block diagram

Block diagram - OBJEX Link v1.6-C3

Pinout

The picture below shows the OBJEX Link v1.6-C3 pinout of its two M0 slots. As you can see some pins like SDA and SCL are present on both M0 slots in order to use at best all pins in the two slots.

For more information on individual GPIOs, we recommend reading the datasheet of the microcontroller used by OBJEX Link v1.6-C3.

Schematic

65KB

IO_SlimStack_rev1.6-C3.pdf

pdf

331KB

OBJEX_LINK-Rev1.6_RISCV.pdf

pdf

Power Consumption

All tests concerning the consumption and energy performance of the board have been carried out using the following tools: Power Profiler Kit II and RIGOL DS1054Z.

Board status	Average	Max	Unit
Idle	26.39	39.94	mA
WiFi On	50.12	190.34	mA
Bluetooth (100% duty cycle)	79.23	149.10	mA
Deep Sleep	4.27	4.66	mA
Ultra Deep Sleep	39.56	40.85	uA

Ultra Deep Sleep

This mode of operation of the board allows you to remove power from all components connected to 3V3. In order to use this mode of the board, it is sufficient to connect PWR_EN to Vbatt. You need an external module or for example the protoboard, you can manage the mode via software by developing a suitable module

Technical specifications

Microcontroller	ESP32-C3FH4
I/O	ADC, SPI, PWM, UART, I2C, I2S
Modules type	x2 M0 or x1 M1
USB	USB-C Type 2.0
WiFi	WiFi 4 | IEEE 802.11 b/g/n-compliant
Bluetooth	Bluetooth® 5.0
LDO	Vin = 5V / Vout = 3.3V
Battery manager	1A Maximum
Battery type	LiPo / Li-Ion
Operating temperature range	−40°C to 105°C
Dimensions	24mm x 24mm
PCB Thickness	1.6mm
Thickness(PCB with USB-C)	5mm
Weight	2.85g

Warranty & Certifications

OBJEX Link v1.6-C3 is currently an experimental prototype, but all components used are RoHS compliant.

OBJEX Link v1.6-C3 does not yet have all the certifications needed for mass sale. Currently, only a few prototypes are distributed for testing and research purposes, and not for real use on IoT devices.