PCF8591: 8-bit A/D and D/A converter { ADC }

[ [ images & links ] ]

Gambar 1.

PCF8591Gambar 2. [einhugur.com]

Features

  • Module supports external voltage input of the 4-way acquisition (voltage input range of 0-5v)
  • integrated photoresistor
  • integrated thermistor
  • integrated potentiometer
  • Modules power indicator
  • Modules with DA output indicator, when the module DA output interface voltage reaches a certain value, will be lit panel the DA output indicator, the higher the voltage, the more obvious indicator brightness
  • Remove shunts to bypass on board integrated devices

 The left connector

  • AOUT chip DA output interface
  • AINO chip analog input interface 0
  • AIN1 chip analog input interface 1
  • AIN2 chip analog input interface 2
  • AIN3 chip analog input interface 3

  The right connector

  • SCL
  • SDA
  • GND
  • VCC – connected to  3.3v-5v

Gambar 3. [arduinolearning.com]

 

Gambar 4. [arduinolearning.com]

 

Gambar 5.[forum.arduino.cc]

 

Product Description [electrodragon.com]

Gambar 6.

Gambar 7.

 

Belajar penggunaan LCD “Nokia 5110” di sistem Arduino [video]

[ [ videos ] ]

 

Logic level converter

[ [ images & links ] ]

Papan logic level converter sering diperlukan jika bekerja dengan dua atau lebih sistem yang mempergunakan tingkat tegangan yang berbeda. Sistem yang bekerja di tingkat tegangan 3.3 V dan tidak memiliki toleransi tegangan sampai 5 V akan sangat mungkin mengalami kerusakan. Untuk mencegahnya diperlukan sistem yang mengalihkan level logika digital dari sistem 5 V dari dan ke level 3.3 V.

Penggunaan sistemnya cukup sederhana, yang penting untuk diingat adalah bahwa sumber tegangan di kedua sisi perlu dihubungkan. Jika misalnya sisi 3.3 V tidak memiliki catau daya sendiri maka pergunakan sumber lain dengan tegangan yang sama sebesar 3.3 V. Contohnya dari papan Arduino, hubungkan 5 V dan 3.3 V ke pin masing-masing yang sesuai. Adapun pin Gnd sudah terhubung antar sisi, sehingga level yang dikonversi diukur berdasarkan acuan yang sama. Jadi, Gnd untuk sistem (termasuk untuk ground sisi 3.3 V) bisa didapatkan hanya dari satu hubungan ke GND pada papan Arduino.

 

Do you have a 3.3V I2C or SPI sensor that might go up in smoke if connected to a 5V Arduino? Or a 5V device that needs a workaround to be compatible with your 3.3V Raspberry Pi, Arduino Due or pcDuino?

To get over this obstacle you need a device that can shift 3.3V up to 5V or 5V down to 3.3V. This is called logic level shifting. Level shifting is a dilemma so common we designed a simple PCB assembly to make interfacing devices a little easier: the Bi-Directional Logic Level Converter.

MOSFET logic level shifting circuitGambar 1.

Annotated BD-LLCGambar 2.

 

~learn.sparkfun.com

 

I2c-Bi-Directional-021Gambar 3. [14core.com]

 

As digital devices get smaller and faster, once ubiquitous 5 V logic has given way to ever lower-voltage standards like 3.3 V, 2.5 V, and even 1.8 V, leading to an ecosystem of components that need a little help talking to each other. For example, a 5 V part might fail to read a 3.3 V signal as high, and a 3.3 V part might be damaged by a 5 V signal. This level shifter solves these problems by offering bidirectional voltage translation of up to four independent signals, converting between logic levels as low as 1.5 V on the lower-voltage side and as high as 18 V on the higher-voltage side, and its compact size and breadboard-compatible pin spacing make it easy to integrate into projects.

Gambar 4.

This logic level converter requires two supply voltages: the lower-voltage logic supply (1.5 V to 7 V) connects to the LV pin and the higher-voltage supply (LV to 18 V) connects to the HV pin. The HV supply must be higher than the LV supply for proper operation. Logic low voltages will pass directly from Hx to the corresponding Lx (and vice versa), while logic high voltages will be converted between the HV level to the LV level as the signal passes from Hx to Lx or Lx to Hx.

~www.pololu.com/product/2595

 

 

RTC DS3231

[ [ images, codes & links ] ]

Keterangan mengenai RTC (Real-Time Clock) sudah pernah disampaikan melalui kutipan di post terdahulu. Di halaman itu yang dibahas adalah komponen RTC DS1307, yang lazim diperdagangkan dalam bentuk papan yang ditandai sebagai Tiny RTC. Kali ini saya coba rangkumkan mengenai DS3231 dari berbagai sumber sebagai awalan untuk memperlajarinya. RTC ini dilaporkan memiliki akurasi yang lebih baik dari RTC DS1307.

Gambar 1.

 

With a backup button cell (e.g. CR2032) on the underside of the module, these DS1307 modules will keep time even when disconnected from the main power source for months and even years on end. However, in our experimental projects (using this RTC with an Arduino for dataloggers amongst other things), we have found these DS1307 modules to vary hugely in their time-keeping accuracy – some gaining/losing a few seconds per day, and others gaining/losing as much as 3-5 minutes per day. While they have proved to be very consistent – i.e. a unit which gains 3 minutes per day will gain 3 minutes per day every day – having to test each unit individually over a few days and then modifying the Arduino project code to cancel out errors is not practical.

Some of the error is caused by ambient temperature changes affecting the accuracy of the timing of the crystal resonator. Some more of the error is also caused by the quality of the crystal itself and its attachment to the PCB in these economical modules.

In extensive testing we have found the time-keeping of these modules to be excellent. The DS3231 chip on the module is marketed as being accurate to 2ppm (parts per million), which means less than one second lost or gained every 5 to 6 days. The units we have tested thus far have all come in at under 1ppm accuracy, so a couple of seconds at most lost or gained per month.

This accuracy is achieved in part by the incorporation of a temperature sensor in the DS3231 which can compensate for changes in ambient temperature. The measurements from this temperature sensor are also accessible to the user (accurate to +/- 3 Celcius) which makes for a handy extra feature. These DS3231 modules also have 32kb of available EEPROM memory which can be utilised by your projects, and many other useful features.

~reuk.co.uk

 

sumber: Benchmarks: Real Time Clocks – Results for Raspberry Pi/Arduino – DS3231 / PCF8563 / MCP79400 / DS1307

 

Gambar 2. [randomnerdtutorials.com]

 

Terdapat beberapa pustaka/library untuk tiap RTC. Dua yang disampaikan dalam “mashup ini adalah pustaka dari Adafruit dan pustaka dari Makuna.

Contoh-contoh kode program sistem Arduino untuk RTC DS3231.

Sistem ini dirancang untuk bekerja dengan menggunakan baterai “khusus”, yaitu baterai yang bisa diisi ulang (rechargeable) seperti LIR2032. Di papan sudah disediakan sistem pengisian ulang untuk baterai tersebut. Karena itu jika kita mempergunakan baterai tipe yang tidak bisa diisi ulang (non-rechargeable) seperti CR2032 maka ada perubahan yang perlu dilakukan. Hal ini untuk mencegah agar baterai primer yang tidak bisa diisi ulang itu tidak berusaha diisi oleh sistem. Caranya adalah dengan melepas/membuang diode seperti pada Gambar 3 berikut.

ds.jpgGambar 3. [sumber: tronixlabs.com]

 

 

Save

RTC DS1307

[ [ images, codes & links ] ]

Gambar 1.

A real-time clock (RTC) is a computer clock (most often in the form of an integrated circuit) that keeps track of the current time.

Although the term often refers to the devices in personal computers, servers and embedded systems, RTCs are present in almost any electronic device which needs to keep accurate time.

Real-time clock

What is an RTC?

A real time clock is basically just like a watch – it runs on a battery and keeps time for you even when there is a power outage! Using an RTC, you can keep track of long timelines, even if you reprogram your microcontroller or disconnect it from USB or a power plug.

Most microcontrollers, including the Arduino, have a built-in timekeeper called millis() and there are also timers built into the chip that can keep track of longer time periods like minutes or days. So why would you want to have a separate RTC chip? Well, the biggest reason is that millis() only keeps track of time since the Arduino was last powered – . That means that when the power is turned on, the millisecond timer is set back to 0. The Arduino doesn’t know that it’s ‘Tuesday’ or ‘March 8th’, all it can tell is ‘It’s been 14,000 milliseconds since I was last turned on’.

OK so what if you wanted to set the time on the Arduino? You’d have to program in the date and time and you could have it count from that point on. But if it lost power, you’d have to reset the time. Much like very cheap alarm clocks: every time they lose power they blink 12:00

While this sort of basic timekeeping is OK for some projects, some projects such as data-loggers, clocks, etc will need to have consistent timekeeping that doesn’t reset when the Arduino battery dies or is reprogrammed. Thus, we include a separate RTC! The RTC chip is a specialized chip that just keeps track of time. It can count leap-years and knows how many days are in a month, but it doesn’t take care of Daylight Savings Time (because it changes from place to place).

~DS1307 Real Time Clock Breakout Board Kit

 

What are Real Time Clocks?

Real time clocks (RTC), as the name recommends are clock modules. The DS1307 real time clock (RTC) IC is an 8 pin device using an I2C interface. The DS1307 is a low-power clock/calendar with 56 bytes of battery backup SRAM. The clock/calendar provides seconds, minutes, hours, day, date, month and year qualified data. The end date of each month is automatically adjusted, especially for months with less than 31 days.

They are available as integrated circuits (ICs) and supervise timing like a clock and also operate date like a calendar. The main advantage of RTC is that they have an arrangement of battery backup which keeps the clock/calendar running even if there is power failure. An exceptionally little current is required for keeping the RTC animated. We can find these RTCs in many applications like embedded systems and computer mother boards, etc.

~www.elprocus.com/rtc-ds1307/

 

 

Arduino Tiny RTC D1307 Tutorial

 

TinyRTC PinoutsGambar 2. [henrysbench.capnfatz.com]

Arduino TinyRTC Tutorial ConnectionsGambar 3. [henrysbench.capnfatz.com]

Gambar 4. [tronixstuff.com]

Connecting your module to an Arduino

Both modules use the I2C bus, which makes connection very easy. If you’re not sure about the I2C bus and Arduino, check out the I2C tutorials (chapters 20 and 21), or review chapter seventeen of my book “Arduino Workshop“.

Moving on – first you will need to identify which pins on your Arduino or compatible boards are used for the I2C bus – these will be knows as SDA (or data) and SCL (or clock).

~ tronixstuff.com

 

 

Tiny RTC

Gambar 5.

Features

  • 5V DC supply
  • Programmable Square-Wave output signal
  • Automatic Power-Fail detect and switch circuitry
  • Consumes less than 500nA in Battery-Backup Mode with Oscillator Running
  • 56-Byte, Battery-Backed, Nonvolatile (NV)RAM for data storage

Gambar 6.

TinyRTC hardware1.jpgGambar 7.

~www.elecrow.com

 

 

RTC DS-1307 with Arduino

DS 1307 RTC Pinout

Gambar 8.

Block Diagram of DS1307

Gambar 9. [Datasheet]

Gambar 10.

~www.theorycircuit.com

 

Terdapat beberapa pustaka/library untuk tiap RTC. Dua yang disampaikan dalam “mashup ini adalah pustaka dari Adafruit dan pustaka dari Makuna.

Contoh-contoh kode program sistem Arduino untuk RTC DS1307.

adafruit: ds1307.ino

 

IR infrared remote control dengan Arduino

[ [ images & links ] ]

Gambar 1. [sumber]

Gambar 2. [sumber]

Infrared IR Receiver Module Wireless Remote Control Kit For Arduino

Description:

Arduino mini infrared wireless remote control kit consists of ultra-thin infrared remote control and 38KHz infrared receiver module. This mini slim infrared remote control with 20 function keys. Its transmit distances up to 8 meters. Ideal for handling a variety of equipment indoors.
IR receiver module can receive standard 38KHz modulation remote control signal. You can decode the remote control signal through Arduino programming. You can design a variety of remote control robots and interactive works.

Specification:

Transmission distance: up to 8m(depending on the surrounding environment, sensitivity of receiver etc)
Battery: CR2025 button battery
Battery capacity: 160mAh
Effective angle: 60°
Sticking material: 0.125mmPET
Effective life: 20,000 times
Static current: 3uA – 5uA
Dynamic current: 3mA – 5mA

~alexnld.com

MAKER Version Electronic Brick Set IR Remote

The IR Remote supplied with this Set looks like this (Others may also be supplied):

– Based on NEC protocol; Built-in 1 x AG10 battery;
– Remote control range: above 8m;
– Wavelength: 940Nm;
– Frequency: crystal oscillator: 455KHz; IR carrier frequency: 38KHz

This is especially good for remote control of a small robot, using the arrow buttons. Below is an example Software Sketch for this remote. The reported buttons will be Forward, Left, Right, Reverse (for the 4 blue button), OK for the red ‘OK’ button, 1 to 0 for the white number buttons, and ‘*’ and ‘#’ for the bottom red buttons.

TYPES OF IR REMOTE CONTROLS
NOTE!! Most handheld remotes are shipped with a small clear plastic piece in the battery compartment that must be removed to activate it. You can usually just pull it out.
There are many different IR remote controls. Some from YourDuino.com are the low-cost IR Infrared Remote Control Kit 2 and also the THIS IR Remote (right) which has directional buttons that would be good for controlling a vehicle etc. Then, there are the typical TV and Stereo Remotes. All of these may have different encoding methods and number of physical buttons, and different codes received when a button is pressed. Below we will give example Software Sketches for a few common IR Remotes.

IR-REMOTE LIBRARY:
Note: The following library must be installed in your Arduino installation for this to work!
CLICK HERE – IR REMOTE CONTROL: ARDUINO LIBRARY

NOTE!! If you have a late version of Arduino with a library IRRobotRemote, it may conflict and you may have to remove that library.
Make sure to delete Arduino_Root/libraries/RobotIRremote. Where Arduino_Root refers to the install directory of Arduino. The library RobotIRremote has similar definitions to IRremote and causes errors.

~arduino-info.wikispaces.com/IR-RemoteControl

Arduino Xinda Remote Control ModuleGambar 3. [sumber]

Arduino Xinda Remote Tutorial ConnectionsGambar 4. [sumber]

Contoh salah satu tabel output dari IR remote control (cocok untuk IR RC Keyes warna hitam dengan tombol arah).

Untuk contoh kode lihat di bagian halaman ini.

z3t0/Arduino-IRremote

Receiving and printing a code:

The following sketch will receive codes and print them to the serial port. This sketch is very useful for testing IR receiving, and for determining what code values to use in your code. A slightly more complex version is in the examples directory as IRrecvDump.

This sketch also illustrates how to perform an action while a button is pressed. In this example, the action is writing to the serial port.

 

IRrecvDemo.ino

IRrecvDump.ino

Arduino Keyes / Xinda IR Remote Control Tutorial

 

IR Remote Tutorial Code Part 2