Eduino WiFi

by schirmilabs in Circuits > Arduino

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Eduino WiFi

Board.png

Eduino WiFi is a DIY Arduino UNO compatible WiFi development board based on the ESP8266EX. I have designed it to teach children soldering, electronics, programming and to build IOT enabled devices.

One design goal was to keep the board as simple as possible to solder. For absolute beginners I pre-assemble the SMT parts.

The board is supported by the ESP8266 project on github: https://github.com/esp8266/Arduino

You can download the project files from here: https://github.com/schirmilabs/Eduino-WiFi

If you want to know more about my work: There is an arcticle from our local newspaper

Features

11 digital input / output pins. All pins support interrupt, PWM, I2C one-wire (except for D0)

1 analog input (3.2V max. Input voltage)

USB B connector

Power supply socket, 6-12 V input voltage

Switching of the supply voltage via two Texas Instruments power-distribution switches (TPS2041 / TPS2051)

Current limitation for both supply voltages (USB / VIn)

Overcurrent display via two red LEDs

PIC 16F1455 as USB microcontroller with official sublicense of USB VID/PID (0x04D8/0xECC6) from Microchip

Reverse polarity protection up to 30V for VIn

Compatible with Arduino

Compatible with NodeMcu

Warning:

All of the IO pins run at 3.3V and are not 5V tolerant

Solder U2: TPS 2041

Step1.png
tps2041.png

Check orientation!

The gray line on the IC has to be positioned upwards, at the little yellow circle inside of the red enclosed area.

Solder U7: TPS2051

Step2.png
tps2051.png

Check orientation!

The gray line on the IC has to be positioned upwards at the little yellow circle inside of the red enclosed area.

Solder U1: AMS 1117 5.0

Step3.png
ams117-50.png

Solder U6: AMS 1117 3.3

Step4.png
ams117-33.png

Solder R15: Resistor 220 KOhm

Step5.png
widerstand_100k.png

Color code is: red, red, black, orange, brown

Solder R16: Resistor 100 KOhm

Step6.png
widerstand_220k.png

Colour code is:brown, black, black, orange, brown

Solder R1, R3, R6, R8, R12, R13, R14, R17, R18: Resistor 10 KOhm

Step7.png
10k.png

Color code: brown, black, black, red, brown

Solder R2, R4, R5, R7, R9, R10, R11: Resistor 1 KOhm

Step8.png
1k.png

Color code:brown, black, black, brown, brown

Solder C1, C3, C5, C7, C8, C10, C12: Capacitor 100 NF

Step9.png
100nF.png

Solder D2: Diode 1N5819

Step10.png
1n5819.png

Check polarity !

The gray marking has to be positioned upwards.

Solder D1: Z-Diode ZPD 5.1

Step11.png
zpd51.png

Check polarity !

The black marking has to be positioned on the left side

Solder D4: Diode 1N4148

Step12.png
1n4148.png

Check polarity !

The black marking hast to be positioned on the right side

Solder D3: Z-Diode ZPD 3.3

Step13.png
zpd33.png

Check polarity !

The black marking has to be positioned upwards.

Solder L1: Ferrit Bead

Step14.png
ferritperle.png

Solder U4: IC Socket 14 Pins

Step15.png
IC_Sockel_14Pin.png

Check orientation !

The notch on the socket has to match the notch as stenciled on the board.

Solder LED4 and LED5: LED 3mm Red

Step16.png
led_3mm_rot.png

Check polarity !

The long leg has to be positioned on the left side (+ sign on the board )

Solder LED1 and LED2: LED 3mm Yellow

Step17.png
led_3mm_gelb.png

Check polarity !

The long leg has to be positioned on the left side (+ sign on the board )

Solder LED3: LED 3mm Green

Step19.png
led_3mm_gruen.png

Check polarity !

The long leg has to be positioned on the left side (+ sign on the board )

Solder SW1: Tact Switch 3x6

Step19.png
tactswitch3x6.png

Solder T1 and T2: Transistor BC 547

Step20.png
bc547.png

The straight edge of the Transistor should match the straight edge of the stencil.

The middle pin has to be bent backwards before assembly.

Solder C4 and C6: Electrolytic Capacitor 47 UF

Step21.png
47uF.png

Check polarity !

The long leg has to be positioned downwards (+sign on the board)

Solder C2 and C9: Electrolytic Capacitor 10 UF

Step22.png
10uF.png

Check polarity !

The long leg has to be positioned on the left side at C2 (+sign on the board) and downwards at C9 (+sign on the board)

Solder X1: DC Power Jack

Step23.png
hohlbuchse.png

Solder X2: USB Type B Connector

Step24.png
usb_buchse.png

Short Circuit Check

Step25.png

Check the bottom side for possible soldering short circuits

Power Supply Check

Step26.png

Connect the board with a PC or a USB charger via a USB-B cable.

The green LED should light up now.

Solder Power: Female Header 8 Pins

Step27.png
Buchsenleiste_8Pin.png

Short Circuit Test

Step28.png

Connect GND and +5V with a jumper wire cable

Then connect the board with a PC or a USB charger via a USB-B cable. The red LED on top should light up now (Overcurrent indicator)

Solder U3: ESP-12 Module

Step29.png
esp12.png

AD: Female Header 6 Pins

Step30.png
Buchsenleiste_6Pin.png

Solder IOL: Female Header 8 Pins

Step31.png
FG6J6CCKWOYZY19.png

Solder IOH: Female Header 10 Pins

Step32.png
Buchsenleiste_10Pin.png

Solder C11: Electrolytic Capacitor 100uF

Step33.png
100uf.png

Check polarity !

The long leg has to be positioned downwards (+sign on the board)

Mount PIC 16F1455

Step34.png
pic16f1455.png

The IC has to be mounted carefully, with the notch in the IC matching the notch in the socket.

Boards Availablity

schirmilabs.png

If anyone would like a board, it is already shared on PCBWay:

https://www.pcbway.com/project/shareproject/Eduino...