Thingspeak - SmartMon Ext Board P4

This is Part 4 of the SmartMon Extension Board series.

SmartMon v2.7ex Board  is a extension board fully compatible with Arduino, ESP8266, ARM, PIC & other available MCu's out there.  As long as your MCU/Dev Board has I2C Bus capabilities you are good to go!
It is probably one of the easiest ways to create your own Voltage/Current and Power consumption monitoring system for your Projects, devices, batteries, power supplies and many more!


UPDATE !! SmartMon v2.7Ex is available also on Tindie Store !





This time we will go thru a full example on how to monitor your power line and load, read Voltage/Current and Power consumtion data and upload them on the Thingspeak related Channel.

Previous Articles:

• Part 1: General Hardware view, schemastics, etc
• Part 2: RTC Driver example
• Part 3: INA219 Driver and a simple data read example 

What we will need:

• ESP8266 nEXT EVO Board
• SmartMon v2.7Ex Board
• For programming and uploading the driver and the software we will continue to use the LuaUploader as before.  

Software implementation:

Thingspeak channels or standalone Thingspeak Server setup part is not covered in this article.
 If interested to see how can be done a standalone Thingspeak Server, please take a look here:
1. RaspberryPI - Standalone Thingspeak Server install
2. RaspberryPI2 - Thingspeak Server install on Jessie 


To make it running, you need also the function from the previous article:

Part 3: INA219 Driver and a simple data read example 


Send data to Thingspeak function

function sendDataTh()
    print("Sending data to thingspeak.com")
    conn=net.createConnection(net.TCP, 0)
        conn:on("receive", function(conn, payload) print(payload) end)
        -- api.thingspeak.com 184.106.153.149
        conn:connect(80,'184.106.153.149')
        conn:send('GET /update?key=T89U8XLJDPQTW0AR&field1='..volt..'&field2='..current..'&field3='..power..'&field4='..peng..'HTTP/1.1\r\n')
        conn:send('Host: api.thingspeak.com\r\n')
        conn:send('Accept: */*\r\n')
        conn:send('User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n')
        conn:send('\r\n')
        conn:on("sent",function(conn) print("Closing connection")
        conn:close()
    end)
    conn:on("disconnection", function(conn) print("Got disconnection...")
    end)
end 

Main Program

---- INA216 Module TEST
init_i2c()
setCAL_reg()
print_values()

If you want to read and update values every minute add function from below:

tmr.alarm( 1, 60000, 1, function()
     print_values()
     sendDataTh()
end)

You can stop your running timer anytime with:

tmr.stop(1)

Smart Mon Ext Board - Software example - P3

This is Part 3 of the SmartMon Extension Board series.

  SmartMon v2.7ex Board  is a extension board fully compatible with Arduino, ESP8266, ARM, PIC & other available MCu's out there.  As long as your MCU/Dev Board has I2C Bus capabilities you are good to go!
It is probably one of the easiest ways to create your own Voltage/Current and Power consumption monitoring system for your Projects, devices, batteries, power supplies and many more!


UPDATE !! SmartMon v2.7Ex is available also on Tindie Store !






Previous Articles:

• Part 1: General Hardware view, schemastics, etc
• Part 2: RTC Driver example

What we will need:

• ESP8266 nEXT EVO Board
• SmartMon v2.7Ex Board
• For programming and uploading the driver and the software we will continue to use the LuaUploader as before.  

Software implementation: 

1.  INIT Data

id = 0
sda = 2
scl = 1
devaddr = 0x40   -- A0,A1 = GND

voltage = 0
current = 0
power = 0
peng = 0
eng = 0

2. I2C  Init function 

function init_i2c()
  i2c.setup(id, sda, scl, i2c.SLOW)
end

3. INA219 Reset function

function reset()
  write_reg(0x00, 0xFFFF)
end

4. Read register function

 --read from reg_addr content of dev_addr
function read_reg_str(reg_addr)
  i2c.start(id)
  i2c.address(id, devaddr, i2c.TRANSMITTER)
  i2c.write(id,reg_addr)
  i2c.stop(id)
  tmr.delay(1)
  i2c.start(id)
  i2c.address(id, devaddr, i2c.RECEIVER)
  c=i2c.read(id, 16) -- read 16bit val
  i2c.stop(id)
  return c
end

5. Read register function - 16bit--returns 16 bit int

function read_reg_int(reg_addr)
  i2c.start(id)
  i2c.address(id, devaddr, i2c.TRANSMITTER)
  i2c.write(id,reg_addr)
  i2c.stop(id)
  tmr.delay(1)
  i2c.start(id)
  i2c.address(id, devaddr, i2c.RECEIVER)
  local c = i2c.read(id, 16) -- read 16bit val
  i2c.stop(id)
  --convert to 16 bit int
  local val = bit.lshift(string.byte(c, 1), 8)
  local val2 = bit.bor(val, string.byte(c, 2))
  return val2
end

6. Write register function

function write_reg(reg_addr, reg_val)
  print("writing reg:" .. reg_addr .. ", reg_val:" .. reg_val)
  i2c.start(id)
  i2c.address(id, devaddr, i2c.TRANSMITTER)
  local bw = i2c.write(id, reg_addr)
  local bw2 = i2c.write(id, bit.rshift(reg_val, 8))
  local bw3 = i2c.write(id, bit.band(reg_val, 0xFF))
  i2c.stop(id)
end

7. Calibration / settings function

function setCAL_reg()
  maxVoltage = 32
  maxCurrentmA = 10000
  write_reg(0x05,3950) --CALIBRATE FOR YOUR rshunt & stuff
  local config = 15391
  write_reg(0x00, config)
end

8. Read Current values (mA)

 function getCurrent_mA()
  local valueInt = read_reg_int(0x04)
  return valueInt
end

9. Read Bus Voltage (V)

 function getBusVoltage_V()
  local valueInt = read_reg_int(0x02)
  -- Shift to the right 3 to drop CNVR and OVF and multiply by LSB = 4
  local val2 = bit.rshift(valueInt, 3)
  local val2 = val2 * 4
  return val2 * 0.001
end

10. Read Shunt resistor voltage drop (mV)

function getShuntVoltage_mV()
  -- Gets the raw shunt voltage (16-bit signed integer, so +-32767)
  local valueInt = read_reg_int(0x01)
  return valueInt * 0.01
end

11. Read Bus Power (W) 

function getBusPowerWatts()
  local valueInt = read_reg_int(0x03)
  return valueInt*20*0.001
end

12. Print read values 

 function print_values()
  volt = getBusVoltage_V()
  print("\nVoltage  :  " .. volt.." V")
  current = getCurrent_mA()/1000
  power = getBusPowerWatts()
  if (current > 65 ) then
         print("ERR 00.23")
         current = 0
         power = 0
  end
  eng = eng + power/60
  print("Current  : " .. string.format("%6.3f",current) .." A")
  print("Power    :  " .. power .." W\n")
  print("Energy   : " .. string.format("%6.3f",eng) .." Wh\n")
end

MAIN Program

---- INA216 Module TEST
init_i2c()
setCAL_reg()
print_values()

If you want to read and update values every minute add function from below:

tmr.alarm( 1, 60000, 1, function()
     print_values()
     sendDataTh()
end)

You can stop your running timer anytime with:

tmr.stop(1)

That's all for today, next time we will more further and we will go thru a full SmartMon Battery Monitor System + Thinkspeak data upload example.
 


All schematics, boards, software and articles released by ESP8266-Projects.com are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. 

Smart Mon Ext Board - RTC clock driver example - P2

Part 2 of the SmartMon v2.7ex series.


UPDATE !! SmartMon v2.7Ex is available also on Tindie Store !



    This time we are exploring the Real Time Clock  implementation and we will see how easy or complicated is to set & program the onboard RTC Clock.







   And the story behind:

    For a complete monitoring/ data logging experience, a nice to have feature is a proper RTC clock. Having this in mind, for the new version of the SmartMon I choose to add it on-board for a very simple and easy integration in your related Voltage, Current, Power projects.

   The choosen one is the PCF8563 from NXP, a very nice and easy to program CMOS Real-Time Clock (RTC) and Calendar optimized for low power consumption. A programmable clock output, interrupt output and voltage-low detector are also provided. All addresses and data are transferred serially via a two-line bidirectional I2C-bus with a maximum bus speed of 400 kbit/s.


Features: 

     •  Provides year, month, day, weekday, hours, minutes, and seconds based on a

        32.768 kHz quartz crystal
     •  Century flag

     •  Clock operating voltage: 1.0 V to 5.5 V at room temperature

     •  Low backup current; typical 0.25uA at Vdd =3.0V and Tamb=25C

     •   400 kHz two-wire I2C-bus interface (at VDD= 1.8 V to 5.5 V)

     •   Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and 1Hz)

     •   Alarm and timer functions - separate Alarm triggered MOSFET output with separate voltage   

                     input/supply included onboard, can direct drive upto 2A external devices, 3/5/12V 

                     Relays, interrupts, etc

     •   Integrated oscillator capacitor

     •   Internal Power-On Reset (POR)

     •   I2C-bus slave address: read A3h and write A2h

     •   Open-drain interrupt pin

Schematic:

SmartMon v2.7Ex - RTC module schematic

 For more details about the RTC, please see PCF8563 Datasheet and the related PCF8563 RTC clock driver Article



What we will need:

• ESP8266 nEXT EVO Board
• SmartMon v2.7Ex Board
• For programming and uploading the driver and the software we will continue to use the LuaUploader as before.  

    Connection with the ESP8266 nEXT EVO Board is very easy, as Analog Extension Board - AN1 connector is fully compatible with the nEXTBus connector:

SmartMon v2.7Ex Board

    This time we are talking here about ESP8266/LUA driver but also Arduino implementation will follow.

    If you use another ESP8266, or Arduino, ARM, PIC, whatever MCU you use there days for your projects, then just be sure that you are connecting the I2C lines (SDA/SCL) on the allocated pins for your setup.


Driver implementation

    As PCF8563 has a I2C compatible compatible interface, driver building it following more or less the same  process  as before for I2C devices.

   For more details about the RTC, please take a deeper look at the  PCF8563 Datasheet and the related PCF8563 RTC clock driver Article.



1. Data conversion functions:

  1.1 Decimal to BCD:

        function decToBcd(val)
             local d = string.format("%d",tonumber(val / 10))
             local d1 = tonumber(d*10)
             local d2 = val - d1
            return tonumber(d*16+d2)
         end
  

1.2  BCD to Decimal:

      function bcdToDec(val)
           local hl=bit.rshift(val, 4)
           local hh=bit.band(val,0xf)
          local hr = string.format("%d%d", hl, hh)
          return string.format("%d%d", hl, hh)
     end

 
2. Init I2C bus/interface:

        address = 0x51, -- A2, A1, A0 = 0
        id = 0

        init = function (self, sda, scl)
               self.id = 0
              i2c.setup(self.id, sda, scl, i2c.SLOW)
       end
 

3. ReadTime function:

   readTime = function (self)
       wkd = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }
       i2c.start(self.id)
       i2c.address(self.id, self.address, i2c.TRANSMITTER)
       i2c.write(self.id, 0x02)
       i2c.stop(self.id)
       i2c.start(self.id)
       i2c.address(self.id, self.address, i2c.RECEIVER)
       c=i2c.read(self.id, 7)
       i2c.stop(self.id)
       return  bcdToDec(bit.band(string.byte(c,1),0x7f)),
               bcdToDec(bit.band(string.byte(c,2),0x7f)),
               bcdToDec(bit.band(string.byte(c,3),0x3f)),
               bcdToDec(bit.band(string.byte(c,4),0x3f)),
               wkd[tonumber(bcdToDec(bit.band(string.byte(c,5),0x7)))],
               bcdToDec(bit.band(string.byte(c,6),0x1f)),
               bcdToDec(string.byte(c,7))
   end


4. SetTime function:

   setTime = function (self, second, minute, hour, day, date, month, year)
       i2c.start(self.id)
       i2c.address(self.id, self.address, i2c.TRANSMITTER)
       i2c.write(self.id, 0x02)
       i2c.write(self.id, decToBcd(second))
       i2c.write(self.id, decToBcd(minute))
       i2c.write(self.id, decToBcd(hour))
       i2c.write(self.id, decToBcd(day))
       i2c.write(self.id, decToBcd(date))
       i2c.write(self.id, decToBcd(month))
       i2c.write(self.id, decToBcd(year))
       i2c.stop(self.id)
   end


For testing,  pack it together and save the code on ESP as 'pcf8563.lua', restart ESP and run:

-- Set Initial Time and Date
require('pcf8563')                                -- call for new created PCF8563 Module Driver
sda, scl = 2, 1                                      --  declare your I2C interface PIN's
pcf8563:init(sda, scl)                           -- initialize I2C Bus
 pcf8563:setTime(0,34,13,12,4,3,15)   -- setTime(s,min,hour,day,weekday,month, year)
-- get Time and Date
require('pcf8563')
sda, scl = 2, 1
pcf8563:init(sda, scl)


s, m, h, d, dt, mn, y = pcf8563:readTime()        --ReadTime function call
=string.format("%s - %s/%s/20%s",dt, d, mn, y)
=string.format(" %s:%s:%s", h, m, s)


Next Article in series can be found here Part 3: INA219 Driver example and software implementation


SmartMon series boards, software and articles by ESP8266-Projects.com are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. 

Smart Mon Ext Board - Voltage, Current, Power monitor - P1

UPDATE !! UPDATE !!

Available also on Tindie Store !








And the story behind:

Do you remember the BLMS (Battery Live Monitor System) Project?

Today we will start a new Battery Live Monitor System (BLMS) series related with the SmartMon v.2.7Ex Board.

   SmartMonv2.7Ex board has been born as the next generation of BLMS, bringing more flexibility and a lot of extra functionalities than the previous one.

   If you want to quickly add to your project Voltage, Current and Power monitoring capabilities, plus, as a bonus, a proper hardware RTC with integrated Alarm and Timer functions, this is the extension board that you was looking for.

  The modular design will let you to easy connect it and use it with any MCU you want as long as it has I2C bus capabilities  and is working in the 3-5.5V voltage range. That includes all the popular existing platforms like Arduino, PIC, ARM, Atmega, ESP8266 and many more!



Because of the ammount of the information, the related main Videos and Articles are splitted in 4 Parts, as follow:

Part1 - General view
Part2 - Real Time Clock driver example
Part3 - Power Monitor software example
Part4 - Real World example with Thinkspeak data upload



Part 1 - GENERAL VIEW


FEATURES:

• TI INA219 integrated high-side current shunt and power monitor
• High precision, high quality shunt resistor from BOURNS: very low Inductance (10nH) and Temperature Coeficient ( ±20 ppm/°C max.)  
• Measured Bus Current interval: 0-10A (standard) / 0-20A (optional) 

• High range Measured Bus Voltages from 0 to 26 V
• Bus voltage is measured directly on the load side of the shunt resistor
• SmartMon v.2.Ex Power supply voltage range - 3.3 to 5.5V
• Standard I2C bus communication ( nEXT Bus connector)
• PCF8563 RTC - real-time clock and calendar optimized for low power consumption
• RTC Alarm and timer functions with MOSFET driven Interrupt output
• On-board regulator option (can be populated and used it when you want to use the same main BUS Voltage input also as a power supply for the SmartMon Board)

Schematics:

High-side Voltage measurement, current shunt and power monitor

 

RTC

Main Bus Voltage Regulator - optional

PCB: 

SmartMon v2.7Ex - Bottom

SmartMon v2.7Ex - TOP

 Next time in Part2 we will continue exploring the SmartMon v2.7Ex Board and also entering on the software side, talking about the  Real Time Clock usage, Driver example, etc.