24 replies to this topic

[smarcus3]

I currently have an LCD screen controlled via a single Ic74HC595. However, using the daisy chain function like this so that the same 3 IO ports can do more than just control a single lcd, but maybe an lcd and leds.

[code=auto:0]Ic74HC595Chain ChainOut = new Ic74HC595Chain(SPI_Devices.SPI1, Pins.GPIO_PIN_D9, 2)/code]

The daisy chain wiring is shown HERE

[Stefan]

Hi smarcus3, It depends on the LCD and it's required speed. Can you specify which LCD?

[smarcus3]

Hi smarcus3,

It depends on the LCD and it's required speed. Can you specify which LCD?

I was hoping you would see this.

Its this one, HERE

[Stefan]

Ahhh... you mean something like this? Cant be done. sorry. Nah, just kidding Let me find the source code, I've got it somewhere but not close atm. If you have a few hours?

[smarcus3]

Yeah so that one daisy chained 595s can drive 1 lcd and other things. Sure take your time. Thanks for the help in advance.

[smarcus3]

I would love to get it in the same format as other 'interfaces' in the toolbox library such as the 7segment led.

[Stefan]

I would love to get it in the same format as other 'interfaces' in the toolbox library such as the 7segment led.

It will be. I've got the code at home. I'll post it here asap

[smarcus3]

Awesome!!! I was going to take a stab at doing it, but if it is already done Ill work on something else. Can't wait to see the code. Thanks

[Stefan]

Use the attached file to combine these two projects:
- .NET Micro Framework Toolbox
- μLiquidCrystal

Sample code:

Ic74HC595Chain IcChain = new Ic74HC595Chain(SPI_Devices.SPI1, Pins.GPIO_PIN_D8, 3); // Used Latch pin is digital pin 8, used SPI-bus is bus 1; pins 11, 12, 13
Ic74HC595LcdProvider LcdProvider = new Ic74HC595LcdProvider(IcChain, 2);
Lcd Display = new Lcd(LcdProvider);
Display.Begin(Width, Height);

Attached Files

•  Ic74HC595LcdProvider.zip   1.66KB   15 downloads

[smarcus3]

Thanks. I assume I wire it up the same as on your site here: https://stefan.co/el...h-bitshift-ics/ I'll try it out tomorrow.

[Stefan]

Thanks. I assume I wire it up the same as on your site here: https://stefan.co/el...h-bitshift-ics/

Yup, and to the LCD like this:
http://geekswithblog...id_crystal.aspx

[smarcus3]

I already got the lcd wired up like that so itll only be re-routing a few wires. Thanks. Ill give you a positive review. Or even 2.

[smarcus3]

I just finnaly got around to testing this and I cannot get the lcd to display anything. Which pins of the IC go to which Pins of the N. I hooked it up like the example but it is not working.

[Stefan]

I hooked it up like the example but it is not working.

Is your LCD requiring 3.3V or 5V?

[smarcus3]

Is your LCD requiring 3.3V or 5V?

I believe 5V but it should be receiving that. All I did was stop using the microlcd library functions and used your lines of code instead. The wiring is unchanged. I think it might be miss wired on the N side.

[smarcus3]

Just figured it out. Thanks

[Stefan]

Just figured it out.

Thanks

Ok cool, what was the issue if I may ask?

[smarcus3]

Wired up wrong.

[Stefan]

Wired up wrong.

Ahh happens to me all the time as well
Glad you got it running now!

[smarcus3]

that it does.