script/libs/mlx90614.lua

   1 --[[
   2 @module mlx90614
   3 @summary mlx90614 红外温度
   4 @version 1.0
   5 @date    2023.01.12
   6 @author  Dozingfiretruck
   7 @usage
   8 -- 用法实例
   9 local mlx90614 = require "mlx90614"
  10
  11
  12 sys.taskInit(function()
  13     -- 硬件i2c方式 618不支持此方式因为618发送会发送停止信号
  14     i2cid = 0
  15     i2c_speed = i2c.SLOW
  16     print("i2c",i2c.setup(i2cid,i2c_speed))
  17
  18     -- 软件i2c 此方式通用,需要 2023.5.8之后编译的固件
  19     --i2cid = i2c.createSoft(18,19)
  20
  21     mlx90614.init(i2cid)
  22     while 1 do
  23         print("mlx90614 ambient",mlx90614.ambient())
  24         print("mlx90614 object",mlx90614.object())
  25         sys.wait(1000)
  26     end
  27 end)
  28 ]]
  29
  30
  31 local mlx90614 = {}
  32 local sys = require "sys"
  33 local i2cid
  34
  35 local MLX90614_ADDRESS_ADR          =   0x5A
  36
  37 local MLX90614_TA                   =   0x06
  38 local MLX90614_TOBJ1                =   0x07
  39 local MLX90614_TOBJ2                =   0x08
  40
  41 --[[
  42 mlx90614 初始化
  43 @api mlx90614.init(i2c_id)
  44 @number 所在的i2c总线硬件/软件id
  45 @return bool   成功返回true
  46 @usage
  47 mlx90614.init(0)
  48 ]]
  49 function mlx90614.init(i2c_id)
  50     i2cid = i2c_id
  51     sys.wait(20)--20 毫秒等待设备稳定
  52 end
  53
  54 local rxbuff = zbuff.create(3)
  55
  56 --[[
  57 获取 mlx90614 环境温度
  58 @api mlx90614.ambient()
  59 @return table mlx90614 环境温度
  60 @usage
  61 local mlx90614_ambient = mlx90614.ambient()
  62 log.info("mlx90614_ambient", mlx90614_ambient)
  63 ]]
  64 function mlx90614.ambient()
  65     local ambient
  66     rxbuff:del()
  67     local ret = i2c.transfer(i2cid, MLX90614_ADDRESS_ADR, MLX90614_TA, rxbuff, 3)
  68     if ret then
  69         ambient = rxbuff[0] | (rxbuff[1] << 8)
  70         ambient = ambient*0.02 - 273.15
  71     end
  72     return ambient
  73 end
  74
  75 --[[
  76 获取 mlx90614 环境温度
  77 @api mlx90614.ambient()
  78 @return table mlx90614 环境温度
  79 @usage
  80 local mlx90614_ambient = mlx90614.ambient()
  81 log.info("mlx90614_ambient", mlx90614_ambient)
  82 ]]
  83 function mlx90614.object()
  84     local object
  85     rxbuff:del()
  86     local ret = i2c.transfer(i2cid, MLX90614_ADDRESS_ADR, MLX90614_TOBJ1, rxbuff, 3)
  87     if ret then
  88         object = rxbuff[0] | (rxbuff[1] << 8)
  89         object = object*0.02 - 273.15
  90     end
  91     return object
  92 end
  93
  94 return mlx90614
  95
  96