Wio Link

[bishop]

Hi all,

I would like to present an interesting esp8266 board i've tried : WIO LINK

This board is build by Seeed Studio, and has the folowing features :
- ESP8266 with 4 MB flash memory
- MicroUSB connector
- Integrated USB to TTL chip for firmware programming (Silabs CP2102)
- Power by USB
- Connector for LiPo battery
- Integrated LiPo battery charger
- Onboard Reset button
- Onboard Push Button (GPIO0)
- Onboard Blue LED (GPIO2)
- 6 "Grove" Ports :
I2C (SDA = GPIO4, SCL = GPIO5)
UART (TX = GPIO1, RX = GPIO3)
ANALOG (GPIO17)
DIGITAL (D0 = GPIO14, D1 = GPIO12, D2 = GPIO13)

A specific feature of this board is that GPIO15 is used to poweron the external devices.
So you must configure GPIO15 as "Output High" in the Hardware Tab of EspEasy.

There is also a smaller board "WIO NODE", which i have not tried yet.

For now, i've played with :
- BME280 Temperature and Humidity sensor on I2C bus
- Air Quality Sensor on Analog Input
- On board push button
- Onboard led
with EspEasy.
I'm reading the values with NodeRed and everything is working very well.

The board is more expensive than others, but the integrated battery charger and the connectors makes it very handy.

Patrice

[papperone]

I don't like at all the fact to use GPIO15 to power up devices, as per EspressIf specs each GPIO can't provide more than 12mA, so I doubt you can run reliable setup with such limit...
I would rather use transistor/mosfet to switch off/off power to the device rather than powering them up directly from a bare GPIO

[bishop]

I don't like at all the fact to use GPIO15 to power up devices, as per EspressIf specs each GPIO can't provide more than 12mA, so I doubt you can run reliable setup with such limit...
I would rather use transistor/mosfet to switch off/off power to the device rather than powering them up directly from a bare GPIO

Hi papperone,

Very interesting comment. In fact the documentation says that VCC of the 6 interfaces are controlled with GPIO15... not powered by GPIO15.

Do you know a way to confirm this ?

Kind regards,

Patrice

Edit : I've found the schematics of WIO NODE, which works the same manner.
https://github.com/SeeedDocument/Wio_No ... 20v1.0.pdf
GPIO15 is connected to two MOSFET Transistors to control the power of the devices.

The schematics of WIO Link is also available, but only in EAGLE format...
https://github.com/SeeedDocument/Wio_Li ... H_v1.0.rar

[papperone]

I don't like at all the fact to use GPIO15 to power up devices, as per EspressIf specs each GPIO can't provide more than 12mA, so I doubt you can run reliable setup with such limit...
I would rather use transistor/mosfet to switch off/off power to the device rather than powering them up directly from a bare GPIO

Hi papperone,

Very interesting comment. In fact the documentation says that VCC of the 6 interfaces are controlled with GPIO15... not powered by GPIO15.

Do you know a way to confirm this ?

Kind regards,

Patrice

Quick search in google I've found a schematic and indeed the GPIO15 is driving a transistor which enables then the 3V3 to power up via a Mosfet the extranal device connectors...
Now it makes sense!

[bishop]

Yes

I will buy a lipo battery and a WIO Node to make more tests.

Regards,

Patrice

[tija]

Hi,

could give a short guide on how to upload espeasy to a WIO_Link?

That would be great.