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-2
votes
2answers
116 views

Why do TI (Texas Instruments) graphing calculators not use TI chips? [closed]

Most semiconductor manufacturers seem particular about using their own products when possible. For example, the Analog Devices Blackfin development board uses another Blackfin processor for the JTAG ...
2
votes
1answer
132 views

What IC is in this particular black blob on my pocket calculator? [duplicate]

I've taken apart my pocket calculator, and I'd like to know what IC is inside the black blob. Is there an IC commonly used in such applications?
0
votes
1answer
238 views

Simple calculator problem [closed]

So I am trying to create a calculator program in arduino using this codes. ...
1
vote
1answer
144 views

Trying to read calculator key presses into PC via parallax propeller chip

I am trying to do read the key presses from a calculator via a parallax propeller board (it's actually a DefCon 20 badge) into my computer via USB. I want the calculator to remain fully functional as ...
-5
votes
2answers
147 views

Calculator with phone keypad question [closed]

I am not an electronic person and found this site in a my quest for the perfect calculator. I use both a phone and calculator for calculations and find the back and forth to cause me to make errors ...
0
votes
2answers
205 views

Calculating “useable amps”

We use a 1650 mAh capacity LiPo battery. It has a 2.5volt undercurrent protection cutoff set. Our device uses a CONSTANT 5mA of draw UNTIL the battery drops down to 3.2V, at which time the system ...
-2
votes
2answers
275 views

how can i connect my usb port to ATmega16

I have a calculator circuit and i want to be connected to pc with a USB port,this circuit contains a ATmega16 micro,my question is how can i see dats that keypad sends in both calculator lcd an pc ...
0
votes
2answers
155 views

How to design voltage ladder on ADC for non linear purposes

I'm designing a 4-bit ADC for a project that receives a reference voltage that ranges from 1.0 to 1.25. The problem is, it's not a linear variation, as in 0001 can be 1.05V, 0010 1.1V but 0011 could ...
-3
votes
2answers
314 views

Arduino 3 digit LCD calculator

We would like to build a calculator using Arduino which uses 3 digit LCD and a keypad similar to digital phones. (# for plus , * for minus) Which components and way is good enough to not to run out of ...
1
vote
0answers
133 views

Impedance calculators differ pretty much?

As you can see here to calculators I found show huge difference or didn't I set it up correctly? I didn't found hints on possible validity limits. Can someone say if one of those given out results ...
8
votes
3answers
853 views

Designing a simple ALU

I need to design an ALU with two 8-bit inputs A and B and control inputs x, y, and z that supports the following operations: ...
3
votes
2answers
595 views

What exactly is happening when a graphing calculator LCD malfunctions when batteries are weak or overloaded?

I'm a beginner in electrical engineering, and I have limited knowledge of how electronics work internally. I'm trying to understand some odd LCD behavior when the batteries are weak or subjected to a ...
1
vote
1answer
625 views

How to calculate Vout in this resistors network?

How do I calculate Vout in terms of Vin and R1,...R5? Vin----+-------+ | | R4 R1 | | +--R5---+--Vout | | R3 R2 | | ...
12
votes
12answers
27k views

How to build a calculator?

I'm a newbie in electronics. I'm trying to build a calculator from scratch as a simple project and side hobby to keep me busy. My goal is to build a simple calculator, not a scientific or graphing ...