First, let me introduce you my project. I made an Alarm clock with extended functionality & thermometer and humiditymeter. Everything started when my friend (who used to bring me some old electronic rubbish and I used to check if there's not something useful) brought me some cashing register display similar like that. When I first see them I knew that I will made from it alarm clock.
I'm programmer and I used to program in many programming languages but this year I started programming in C for Atmel microcontrolers (attiny 85, atmega 8, atmega 328, atmega329, atmega 128 etc...). When I discovered DHT11 (temperature and humidity sensor) I programmed simple clock with thermo&humidity meter. I haven't got any case for my project so I imagine that when I cut off column from cashing register display case I will have the case of my dreams for my project.
As microcontroler I used Atmega329p because I have and few of them and they got enough pins for my project.