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This is my make-through for the week's assignment. Grab a cup of coffee!
PROCESS MAP
PROCESS MAP
Short Intro
I will Design, fabricate, and solder an Input Module PCB and an Output Module PCB, and program your ATTiny44 microcontroller board so that it processes different data signals from the Input Module and controls different actions at the Output Module.
Targets of the week
PCB Design: I will follow the schematic diagram for the Input Module (containing an Op-amp and Multiplexer) and Output Module (containing MOSFET and Shift Register) to design Two PCBs, and export the design files into the final PNG format (the all component are in the two PCBs is entirely through-hole)
Fabrication & soldering: Fabricate the Input and Output modules using PCB milling machine and solder the components
Input Module: Components List
Output Module: Components List
Note that all components are through-hole, except for the high power LED. You will need to solder two jumper wires directly to the two pins of the high power LED, then connect the male jacks on the free end of the jumpers to the 2-pin screw terminal).
Programming: Program your ATTiny44 microcontroller board to do the following:
Take an analog input signal from the Thermistor on the input module in order to control a high power LED connected to the Output module (at the load pin headers)
Take a digital input from the Dip switches to control each RGB color separately at the Output module
BACKGROUND
BACKGROUND
Let's start the my forth journey.
Journey taken place in my home and Fab Lab.
main goal journey: Design input and output PCP
Story Characters: Eagle, CNC milling machine, and welding machine.
My goal in this week are
Describing the rationale behind the design of the input and output module boards: how does the input board handle analog signals (from thermistor) before feeding them to the microcontroller? how does the multiple input signals (from the thermistor and Dip switches) are handled with only one input pin at the microcontroller?
how do high power loads (e.g. high power LED) are driven at the output board? how does multiple output signals (to the RGB LED and High Power LED) are driven by a single output pin at the microcontroller?
Describing how the fabricated and soldered the input and output boards
Describing how me programmed the ATTiny44 board to create a smart interaction between the inputs and outputs.
Describing some problem faced me.
OBJECTIVE #1:Describe the rationale behind the design of the input and output module boards:
OBJECTIVE #1:Describe the rationale behind the design of the input and output module boards:
Trial #1 (Unsuccessful): Though Hole Components
Trial #1 (Unsuccessful): Though Hole Components
Short brief one Multiplexer: is selector which choose one (Y) channel from four input (I0, I1, I2, I3) signals to read by using the selecting pins (S1, S2). For example, if you have four sensors, and you want to connect in signal pin. Selectors Pins are (ABC) with (six Probability) and eight pins as input (sensor), and output pins is Y. And one pin for VCC and GND. Using function table to control which pin I will read from. The table contain STROBE (G) same as enable If I make high the multiplexer will not work. Choose your desired pin. Input in the eight pin is digital not analog pins. If your sensors is analog such as temp sensor you can use 74HC4051 multiplexer.
Trial #1 (successful): To expand the output (digital )pins I will shift register. we will deal with serial date in (single input) and 4-bit data output (when separate output) there are many shift register such as serial in and serial output. The process require shifting on the output pins to sent data to Q(D) pin It must pass on the other pins with giving pulsing on clock. Latch Pin plays the role of showing at specific moment the all output on pins after making pulse on the LATCH Clock. LATCH can be consider as the memory which save data on output pins after sent the pulse on LATCH Clock.
Trial #1 (successful): To expand the output (digital )pins I will shift register. we will deal with serial date in (single input) and 4-bit data output (when separate output) there are many shift register such as serial in and serial output. The process require shifting on the output pins to sent data to Q(D) pin It must pass on the other pins with giving pulsing on clock. Latch Pin plays the role of showing at specific moment the all output on pins after making pulse on the LATCH Clock. LATCH can be consider as the memory which save data on output pins after sent the pulse on LATCH Clock.
Shift and LATCH clock
OBJECTIVE #2: Fabrication, Welding and Testing (Describing how the fabricated and soldered the input and output boards )
OBJECTIVE #2: Fabrication, Welding and Testing (Describing how the fabricated and soldered the input and output boards )
Trial #1 (Unsuccessful):
Trial #1 (Unsuccessful):
Component list of Input circuit
Though Hole Components and the design rules and libraries used are shown in the next figures. Note that we use the library of led RGP through hole (it contains four legs (green, red, blue, and GND )in out pins.
Though Hole Components and the design rules and libraries used are shown in the next figures. Note that we use the library of led RGP through hole (it contains four legs (green, red, blue, and GND )in out pins.
step 1: Use all, Right click on each library and make sure you use all library (green circle). Warning, each time you use Eagle You should make libraries use all.
step 1: Use all, Right click on each library and make sure you use all library (green circle). Warning, each time you use Eagle You should make libraries use all.
step 2: Searching on component. go to left window (two columns) and you will find add part search about your components name choose ( smd or through hole = Pads). Remember, to use " if you missed part of component name.
step 3: Finishing the schematic and go to Board, In second tool par after bar you will find button (Generate/ switch to board) make click.
DRC: Rules follow the following photos to make sure that your design rules are correct.
Output Schematic
Output board
Input Schematic
Input Board
Input circuits
Problem found : Output circuits: I can't find 2 zero ohm resistance so that I will use the any solid wire rather than Tin then I know that I can't use tin as wire. I try to remove but we I applied heat from iron and hot air the tin melt in the hole.
Trial #2 (Successful): A glimmer of hope
Trial #2 (Successful): A glimmer of hope
Problem: welding and Short circuits uspasp
Potential Solution: asking for helping and tiring to remove tin.
OBJECTIVE #3: Coding and Testing (Describing how you programmed the ATTiny44 board to create a smart interaction between the inputs and outputs)
OBJECTIVE #3: Coding and Testing (Describing how you programmed the ATTiny44 board to create a smart interaction between the inputs and outputs)
Trial #1(Successful): Understanding & testing input board
Trial #1(Successful): Understanding & testing input board
Step1: I watched the videos many times. I understand the concept behind the components in input specially the Multiplexer.
Step2: Download the 74HC4051 multiplexer to know the pins out Datasheet .
Step3: I do a testing code for this input board by selecting the output will show on led 13 on Arduino board. Then, I explain each line in the code to make it as reference. see video Video of testing input PCP. (condition on pin zero and one I choose pin(zero) and pin(one) are low led on Arduino board is high (pushing the switch ). and read my comment in the code code
Step4: Next step, I programed the ATTINY44 board.
Trial #2(Successful): Understanding & testing output board
Trial #2(Successful): Understanding & testing output board
Step1: I watched the videos many times. I understand the concept behind the components in input specially the shift register.
Step2: I watched this video and also understand the logic of the output circuit.
Step3: I did a small testing code for this board by lighting up each color on the RGB by input and output a shift number at a time for the shift register. For example, input (2) to light up Red, input (5) to light up Green. Video of testing output pcp. and code
Step4: I programed the ATTINY44 board.
OBJECTIVE #3: using each switch from the Dip switch to Control each color from the RGB led.
OBJECTIVE #3: using each switch from the Dip switch to Control each color from the RGB led.
Step1: I have problem with my Attiny board there is short circuit so that i worked using Arduino.
Used boards I/O boards, ATTINY44 & Arduino USBasp to upload the code to ATTINY44 (Arduino).
Step2: wiring input board to ATTINY44 or Arduino
S0 (pin 11) to pin 8
S1 (pin 10) to pin 9
S2 (pin 9) to pin 10
Mux out (pin 5) to pin 2
Vcc (pin 16) to 5V
GND (pin 8) to ground
Step3: wiring output board to Arduino and ATTINY44
Serial Data (pin 14) to pin 3
Shift Clock (pin 12) to pin 5
Latch Clock (pin 11) to pin 4
Vcc (pin 16) to 5V
GND (pin 8) to ground.
the result show in the next video the change of color from blue to green to red it depend on the dip switches. you can see the condition of working the following code.
The first trial I replace the pin of the latch with shift clock. (solved)
The second step is to make a smart combination between the two boards, I will light high power LED on the OUTPUT if the temperature rises above the pre-specified temperature or the voltage reference is change.
CONCLUSION
CONCLUSION
What I learned this week is...
The Idea of multimixer and shift register.
Understanding and using the multiplexers and shift register to expand the inputs and outputs of microcontrollers.
Understanding the idea of Op-amp for the purpose of converting analog signals into digital signals
Understanding and use the MOSFET in order to drive high power components
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