OBJEX Link v1.7-C3 RISCV

Overview

OBJEX Link v1.7-C3 is the RISC-V version of the series. This version of OBJEX Link v1.7-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 (deep sleep: 12uA)

  • 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

Pinout

The picture below shows the OBJEX Link v1.7-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 v1.7-C3.

Protoboard v2.0

The protoboard v2.0 can be used with OBJEX Link v1.7-C3, but the number/name of Pin/GPIOs in some cases does not match with the silkscreen.

OBJEX Link v1.7-C3Protoboard v2.0

5V

5V

3V3

3V3

BATT

BATT

VDD

VDD

not used

EN

RTS

RTS

Battery lvl(GPIO3 - ADC1_CH3)

GPIO14

GPIO20

SDA

GPIO21

SCL

GPIO2

D25

GPIO4

D16

GPIO5

D5

GPIO6

D39

GPIO7

D13

GPIO10

D18

Schematic

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 statusAverageMaxUnit

Idle

18.08

30.05

mA

WiFi On

TBC

TBC

mA

Bluetooth On

TBC

TBC

mA

Deep Sleep

12.14

14.21

uA

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

3.24g

Warranty & Certifications

OBJEX Link v1.7-C3 is currently an experimental prototype, but all components used are RoHS compliant.

OBJEX Link v1.7-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.

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