-- 7 Segment Display for MCP23008 by John Longworth December 2017
-- Using pins 3 & 4 to be compatible with ESP001
-- 7 segment digit 1 = b + c = 64 + 32       =  96 (0x60)
-- 7 segment digit 2 = abdeg = 128+64+16+8+2 = 218 (0xDA)...
-- DP = 1 added to display to show decimal point
-- Uses mcp23008.lua - This file must be in the ESP8266 memory

nums = {0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6,0xFC} -- 1, 2 ...0
local i = 1
mcp = require ("mcp23008")
id = 0x00  -- Always 0
sda = 3  -- GPIO0 Connect to Pin 2 of MCP23008 
scl = 4  -- GPIO2 Connect to Pin 1 of MCP23008 

mcp.begin(id,sda,scl,i2c.SLOW)
mcp.writeIODIR(0x00)  -- Set all GPIO pins as outputs

tmr.alarm(0,500,1,function()    
    local segs = nums[i]
    if (i % 2 == 1) then           -- Toggle decimal point
        segs = segs + 1 
    end
    mcp.writeGPIO(segs)   
    print(segs)
    i = i + 1
    if (i > 10) then 
        i = 1 
    end        
end)