Hi, is it possible to interface a LCD with a circuit output (analog) without a MCU. i mean i dont want to program a MCU, rather want a circuitry for interfacing (if any). any suggessions would be apprecited

 

What kinds of LCD，as a 20*2, 16*2?
What is your practical application?

 

its possible but doesnt make much sense. you need decoding IC or ICs

There is ICL 7107 which has 7seg driver for 4 digits.

NO info about the LCD.

 

This is Pt1 of a 2pt article and shows how to implement it manually, you can take the logic from there.
Max.

 

What kinds of LCD，as a 20*2, 16*2?
What is your practical application?

16x2....the application is a simple voltmeter, displaying the measured voltage from a sensor.

 

its possible but doesnt make much sense. you need decoding IC or ICs

There is ICL 7107 which has 7seg driver for 4 digits.

NO info about the LCD.

i see. i understand. what would be the simplest MCU based solution then. can you suggest some links.

 

With a datasheet and/or user manual for the LCD, it can be done. But plan on lotsa ICs. Sensor int A/D converter, data word or words clocked into a latch, decoded into equivalent BDC digits, multiplexed into LCD with necessary command signals.

ak

 

16x2....the application is a simple voltmeter, displaying the measured voltage from a sensor.

How much voltage? More than 5v?

 

How much voltage? More than 5v?

no, less than 1 v.

i am looking for a very small solution. LCD (3 digit is enough) and MCU both must be of small scale.

 

You could just buy a complete DVM display using an LED display, they are really cheap and work straight out of the packet no additional wires required when measuring over about 3V, single additional supply voltage otherwise. eg. http://www.banggood.com/0_28-Inch-2_5V-30V-Mini-Digital-Voltmeter-p-974258.html

 

http://playground.arduino.cc/Code/LCD

 

http://playground.arduino.cc/Code/LCD

My eyes, my eyes!

I think that the Arduino-board is a bit overkill.

It would be nice if the TS gave us a bit more info.

 

What about buying a cheap DMM - http://r.ebay.com/pYlNA8 for example - ripping the guts out of it and using that. I know it's got more functions than you want but in terms of time and materials probably cheaper than making your own.

 

You could just buy a complete DVM display using an LED display, they are really cheap and work straight out of the packet no additional wires required when measuring over about 3V, single additional supply voltage otherwise. eg. http://www.banggood.com/0_28-Inch-2_5V-30V-Mini-Digital-Voltmeter-p-974258.html

I was think and tried to introduce this kinds of led DVM, but since the TS want to measure less than 1V, so I give up for this, I got this one in hand and designed the circuit for measuring the voltage less than 3V, but not completed yet.

 

What about buying a cheap DMM - http://r.ebay.com/pYlNA8 for example - ripping the guts out of it and using that. I know it's got more functions than you want but in terms of time and materials probably cheaper than making your own.

I just thought that this DVM could be using it as voltage monitor and put it with some other stuffs together.

 

I was think and tried to introduce this kinds of led DVM, but since the TS want to measure less than 1V, so I give up for this, I got this one in hand and designed the circuit for measuring the voltage less than 3V, but not completed yet.

I think you can measure below 1V on some units it's just a case of having a separate power supply for the display. I haven't bothered to search for one that does measure below 1V that's left up to the OP.

 

You could just buy a complete DVM display using an LED display, they are really cheap and work straight out of the packet no additional wires required when measuring over about 3V, single additional supply voltage otherwise. eg. http://www.banggood.com/0_28-Inch-2_5V-30V-Mini-Digital-Voltmeter-p-974258.html

its cool indeed. i need to interface with a A/D since my sensor signal is analog.

 

0.28 Inch 2.5V-30V Mini Digital Voltmeter Voltage Tester Meter

Feature:

Detection voltage: DC2.5V ~ 30V
Working current: <30mA
Display: 0.28 inch LED
Dimensions: 31 × 12.0 × 9mm (length x width x height)
Installation hole: 23 × 10 mm
Measurement rate: ≥200mS / times
Accuracy: 1% (+/- 1 word)

Detection voltage is from 2.5v - a bit too high for your less than 1v.

 

I think you can measure below 1V on some units it's just a case of having a separate power supply for the display. I haven't bothered to search for one that does measure below 1V that's left up to the OP.

Oh, that's great, I will tell my friend that maybe he can buy that kinds of the type next times, thank you.

 

http://playground.arduino.cc/Code/LCD

adurino is a smart solution but need a bit of time and money.