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Io - Internet of things ESP32 Microprocessor - Wi-Fi and Bluetooth with IOT-Bus form factor

Buy it here.

The Io offers a 240 MHz, 32-bit processor with 4Mb of flash memory and integrated WiFi and Bluetooth in very small form factor (approximately 2x1 inches). The Io accepts all of the IoT-Bus modules and can be bought in with male, female or stacking headers.

The oddWires IoT-Bus System is based on a low-cost, open design that includes multiple main boards including a minimalist, breadboard-friendly form factor (Io). There is also a version with a large prototyping area which enables a single-board IoT solution (Proteus). This vrsion includes both 3.3V and 5V power rails

At the heart of the system is an IOT-BUS providing two SPI and two I2C interfaces with plenty of general purpose I/O. The Espressif ESP-WROOM-32 has been selected as the microcontroller enabling very low-cost deployment of production IoT devices. It offers 240Mhz, 32-bit processing with 4MB of flash as standard.

All together the oddWires IoT-Bus can provide Wi-Fi, Bluetooth, BLE 4.0, Ethernet, LoRa, and Canbus connectivity so no matter what you are communicating with, oddWires has a solution for you.

Our first expansion boards are an opto-isolated relay controller and a motor controller capable of controlling four DC motors or two stepper motors. Watch this space for more!



  • Open Design
  • Low-cost
  • Plug and Play, Expandable
  • Powerful 240MHz, 32-bit Processor with 4Mb of Flash Memory
  • Multiple Form Factor Main Boards (Io, Proteus)
  • Connected in Every Major Way (Wi-Fi, Bluetooth, BLE 4.0, Ethernet (September), LoRa, and Canbus)
  • Integrated Display Available, Solder-able Prototype Board with Controller
  • IOT-Ready, Relay and Motor Controller
  • SDK based on FreeRTOS
  • Arduino-compatible



ESP-WROOM32 Wifi Bluetooth Combo Module



The ESP-WROOM-32 Wifi Bluetooth combo module is ultra high performance and ultra low-power consumption FCC-approved (2AC7Z-ESPWROOM32) Wi-Fi and Bluetooth combo wireless platform based on ESPRESSIF ESP32 chipset. It integrates a dual-core processor, 448 KByte ROM,520 KByte SRAM,16 KByte SRAM in RTC, 802.11 b/g/n/e/I Wi-Fi, Bluetooth v4.2 BR/EDR & BLE, clocks & Times, abundant peripheral Interfaces and security mechanism.

The ESP-WROOM-32 Wifi Bluetooth combo module provides SDK Firmware for fast on-line programming and open source toolchains based on GCC for development support. It is designed for Generic low power IoT sensor hub, loggers, video steaming for camera, Wi-Fi & Bluetooth enabled devices, Home automation and mesh network applications, aimed at makers, hardware engineers, software engineers and solution provides. ESP32 is a single chip 2.4 GHz Wi-Fi and Bluetooth combo chip designed with TSMC ultra low power 40 nm technology. It is designed and optimized for the best power performance, RF performance, robustness, versatility, features and reliability, for a wide variety of applications, and different power profiles.

ESP32 is the most integrated solution for Wi-Fi + Bluetooth applications in the industry with less than 10 external components. ESP32 integrates the antenna switch, RF balun, power amplifier, low noise receive amplifier, filters, and power management modules. As such, the entire solution occupies minimal Printed Circuit Board (PCB) area. ESP32 is designed for mobile, wearable electronics, and Internet of Things (IoT) applications. It has many features of the state-of-the-art low power chips, including fine resolution clock gating, power modes, and dynamic power scaling. 

Key Features
 • CPU and Memory: Xtensa® 32-bit LX6 Dua-core processor, up to 600 DMIPS.
      • 448 KByte ROM
      • 520 KByte SRAM
      • 16 KByte SRAM in RTC.
      • QSPI can connect up to 4* Flash/SRAM, each flash should be less than 16 Mbytes.
      • Supply Voltage: 2.2V~3.6V
      • 802.11 b/g/n/e/i
      • 802.11 n (2.4 GHz), up to 150 Mbps
      • 802.11 e: QoS for wireless multimedia technology.
      • WMM-PS, UAPSD
      • MPDU and A-MSDU aggregation
      • Block ACK
      • Fragmentation and defragmentation
      • Automatic Beacon monitoring/scanning
      • 802.11 i security features: pre-authentication and TSN
      • Wi-Fi Protected Access (WPA)/WPA2/WPA2-Enterprise/Wi-Fi Protected Setup (WPS)
      • Infrastructure BSS Station mode/SoftAP mode
      • Wi-Fi Direct (P2P), P2P Discovery, P2P Group Owner mode and P2P Power Management
      • UMA compliant and certified
      • Antenna diversity and selection
      • Compliant with Bluetooth v4.2 BR/EDR and BLE specification
      • Class-1, class-2 and class-3 transmitter without external power amplifier
      • Enhanced power control
      • +10 dBm transmitting power
      • NZIF receiver with -98 dBm sensitivity
      • Adaptive Frequency Hopping (AFH)
      • Standard HCI based on SDIO/SPI/UART ? High speed UART HCI, up to 4 Mbps
      • BT 4.2 controller and host stack
      • Service Discover Protocol (SDP)
      • General Access Profile (GAP)
      • Security Manage Protocol (SMP)
      • Bluetooth Low Energy (BLE)
      • ATT/GATT
      • HID
      • All GATT-based profile supported
      • SPP-Like GATT-based profile
      • BLE Beacon
      • CVSD and SBC for audio codec
      • Bluetooth Piconet and Scatternet
Clocks and Timers
      • Internal 8 MHz oscillator with calibration
      • Internal RC oscillator with calibration
      • External 2 MHz to 40 MHz crystal oscillator
      • External 32 kHz crystal oscillator for RTC with calibration
      • Two timer groups, including 2 x 64-bit timers and 1 x main watchdog in each group
      • RTC watchdog
Peripheral Interface
      • 12-bit SAR ADC up to 18 channels
      • 2 × 8-bit D/A converters
      • 10 × touch sensors
      • Temperature sensor
      • 4 × SPI, 2 × I2S, 2 × I2C, 3 × UART
      • 1 host (SD/eMMC/SDIO), 1 slave (SDIO/SPI)
      • Ethernet MAC interface with dedicated DMA and IEEE 1588 suppor
      • CAN 2.0
      • IR (TX/RX)
      • Motor PWM, LED PWM up to 16 channels
      • Hall sensor
      • Ultra low power analog pre-amplifier
      • IEEE 802.11 standard security features all supported, including WFA, WPA/WPA2 and WAPI
      • Secure boot
      • Flash encryption
      • 1024-bit OTP, up to 768-bit for customers
      • Cryptographic hardware acceleration: -AES-HASH(SHA-2) library-RSA-ECC-Random Number Generator (RNG)
Development Support
      • SDK Firmware for fast on-line programming
      • Open source toolchains based on GCC
      • Generic low power IoT sensor hub
      • Generic low power IoT loggers
      • Video streaming from camera
      • Over The Top (OTT) devices
      • Music players - Internet music players - Audio streaming devices
      • Wi-Fi enabled toys - Loggers - Proximity sensing toys
      • Wi-Fi enabled speech recognition devices
      • Audio headsets
      • Smart power plugs
      • Home automation
      • Mesh network







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