iTriangle HW overview

Hardware Overview


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Part Function
MCU ESP8266
Digital Port 0 GPIO 14
Digital Port 1 GPIO 12
Digital Port 2 GPIO 13
Analog Port A3
UART Port Pin 1 & Pin 3
I2C Port Pin 4 & Pin 5
Status Light Blue LED is the WiFi status indicator, Red LED indicates the working status
Configure Button To configure and manage your iTriangle
Battery Holder JST2.0
Micro USB To power the board or communicate with a PC
Reset Button

To reset the MCU

General Value Power Management Value
Size 55mm * 48mm DC Current Per I/O Pin 12 mA
Crystal 26 MHz Input Voltage (Micro USB) 5 V
Flash Memory 4 MBytes (W25Q32B) Input Voltage (Battery holder) 3.4~4.2 V
Wi-Fi Network Protocol 802.11 b/g/n Output DC Current 1000 mA MAX
Wi-Fi Encryption Technology WEP/TKIP/AES Operating Voltage 3.3 V
Grove Connectors 6 Charge Current 500 mA MAX
Flash 4 MB (W25Q32B) LifeTime of FLASH 10.000 write cycles

Pay attention to FLASH write cycle  limits. Programs are stored in FLASH and each new firmware build or offline code update increases the internal write count. After the FLASH write limit is exceeded, the board will probably work well for the next few thousands cycles, but there is no legal warranty for exceeding the limit.

Status LEDs

Two status LEDs, blue and red, can be seen near the FUNCTION button. The blue LED indicates network status and has the following blink patterns:

Zfe0uQ1zgj7jgF4Q-help01_breathing.gifblinking slowly – configuration mode

TkkwZHEDtHSHzmeH-help06_blink_1s.gifon for 1s, then off for 1s – the node is online

sHnEUKKkFlHCufus-help04_no_blink.gifcontinuously on – the node is not available/has no IP/not connected to server.

The blue LED is connected to GPIO2, which is also the TX pin of UART1. When downloading firmware, the UART1 dumps the data transmitting on UART0 automatically. The Bblue LED will therefore blink while downloading firmware. After startup, the GPIO2 will be configured as a GPIO, not TX of UART1.

The red LED is another status LED and indicates the power status of Grove modules. The six VCC headers converge and can be controlled with GPIO 15. When the node is in deep sleep mode, all of the modules lose their power too. The red LED will light up when the modules are powered and switch off when modules are not powered.

Bonus!

iTriangle has an inbuilt LiPo battery charger. You can charge a 3.7 V LiPo battery with the JST 2.0 Port when connected by USB.

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