nodemcu read EEPROM lua

eeprom.lua

print("eeprom")
GPIO_PIN = 7    --interrupt pin
id=0
device = 0x50   -- address of EEPROM
memadr=0x00                                                   -- let's read from begining
sda, scl = 4,5
i2c.setup(id, sda, scl, i2c.SLOW)
buffer = adc.read(0)
--string.sub (buffer, 1 , 40)
--string.sub (buffer, 4 , 11)
--print (buffer)

        --writing into EEPROM--
function WriteEE(memloc, data)        
    addrh=bit.rshift(memloc, 8)
    addrl=bit.band(memloc,0xff)
    i2c.start(id)
    i2c.address(id, device, i2c.TRANSMITTER)
    i2c.write(id, addrh)
    i2c.write(id, addrl)
    i2c.write(id,string.byte(data))
    i2c.stop(id)
    print("EEPROM WRITE COMPLETED")
end 


                    --reading from EEPROM--
function ReadEE(memloc, length)  
    addrh=bit.rshift(memloc, 8)
    addrl=bit.band(memloc,0xff)
    i2c.start(id)
    i2c.address(id, device, i2c.TRANSMITTER)
    i2c.write(id, addrh)
    i2c.write(id, addrl)
    i2c.stop(id)
    i2c.start(id)
    i2c.address(id, device, i2c.RECEIVER)
    c = i2c.read(id, length)
    i2c.stop(id)
    print("EEPROM READ COMPLETED")
    
    return  c
end   


    --interrupt function--
function interrupt(level, stamp)-- callback function while interrupt
     tmr.delay(700000)
     operation()
    
    gpio.trig(GPIO_PIN,"up", interrupt)--re-enable interrupt on pin while exit
end
            --main operation--
function operation()
WriteEE(memadr,adc.read(0))
a = adc.read(0)
b = func(a)   --to make to print only the required data as in the window shown--
reg = ReadEE(0,string.format(b)) -- Read 286 bytes of data
print("analog value is: ",reg)
end


        --to make it to print particular data--
function func(a)
    c=0
    while( a ~= 0)
    do
        a = a/10
        c = c + 1
    end
    return c
end