16F84 IR Receiver

Changes :

13/09/2003 : Added date to digital clock.
15/09/2003 : Fixed a bug in the 'goto line x' routine.
17/09/2003 : Replaced send-script with irtext.c
04/10/2003 : Changed irtext.c so that it can send characters > 127.
24/12/2003 : Only show the digital clock when the time is set correct.

1. What? :

With this Infra Red Receiver you can show text on a HD4478 LCD Display, whereby the text comes from an Infra Red Transmitter that is connected to a PC. In this Infra Red Receiver is also a digital clock present (time + date) that is shown when there is no Infra Red Signal received for a while. Adjusting the clock is also done with Infra Red. The digital clock will only be displayed when the time/date is set, otherwhise the screen will be blanked.

The hard- en soft-ware for the transmitter can be found at http://www.lirc.org/.

2. Schematic :

Below, You can download the schematic :

This schematic is made with geda-gschem

3. The real thing :

4. The PIC16F84 assembly program :

You can download the program here .

5. Software PC :

The basic software for transmitting that I use is the lirc-software.

5.1. lircd.conf :

Add this to your /etc/lirc/lircd.conf :

5.2. Transmitting data :

With lirc comes a program irsend or rc (depends on the distribution that is used). This program can be used to transmit text. Some examples :

irsend send_once lcd ascii84 ascii101 ascii115 ascii116 --> Transmit the text 'Test' to the lcd-display
irsend send_once lcd ascii0 ascii0 --> Blank the lcd-display
irsend send_once lcd ascii0 ascii1 --> goto line 1
irsend send_once lcd ascii0 ascii2 --> goto line 2
irsend send_once lcd ascii0 ascii3 --> goto line 3
irsend send_once lcd ascii0 ascii4 --> goto line 4
irsend send_once lcd ascii0 ascii5 ascii11 ascii10 ascii0 --> Set the clock to 11:10:00
irsend send_once lcd ascii0 ascii6 ascii13 ascii9 ascii20 ascii3 --> Set the date to 13/09/2003

5.2. Transmitting text :

Because sending text with irsend/rc is cumbersome, I have written a little program in C so that transmitting text is easier to do. You can find the source of this C-program here (color html) or here (plain text) .