From ESPBasic Version 3.0 Alpha 43 you have also the i2c.setup function available!!
i2c.setup():
Will change the default pins for the i2c interface.
i2c.setup({SDA}, {SCL})
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From today I will start a new Series related with ESP Basic (www.esp8266basic.com)
When working with a lot of I2C devices one of the first thing that you need is a simple I2C scanner that can help you to identify the IC's and do some very basic troubleshooting.
What we will need:
- ESP8266 nEXT EVO Board
- ESP8266 nEXT EVO - Analog Extension Board - AN1 (I2C devices onboard to test our scanner )
- For programming and uploading the driver and the software we will use ESP8266 Basic .
nEXT EVO + AN-1 extension board
I2C Scanner Software:
UPDATE !! UPDATE !!UPDATE !!UPDATE !!
From ESPBasic Version 3.0 Alpha 43 you have also the i2c.setup function available!!
i2c.setup():
Will change the default pins for the i2c interface.i2c.setup({SDA}, {SCL})
i2c.setup(4,5)
for address = 1 to 127
i2c.begin(address)
stat = i2c.end()
if stat < 1 then
' print stat
wprint "Found I2C device at address: 0x" & hex(address)
wprint " - > " & address
wprint " <br>"
endifnext
And the scanning result in browser :
wait
As you can see, has properly detected the I2C devices that are on the AN-1 Extension board:
- PCF8574 - 8Bit I/O EXT port - found at address 0x20 -> 32
- LM75 - Temperature sensor - found at address 0x48 -> 72
- MCP4728 - 4x12Bit DAC - found at address 0x60 -> 96
- MCP3421 - 18Bit ADC - found at address 0x68 -> 10
Don't forget to add if needed pullup resistors on both lines, 4K7 should be OK. In case of AN-1 they are NOT needed.
1 comment:
Hi,
Can you post a code with a memory I2C device such as 24C32.
Thanks
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