Radio frequency remote for my workshop

My project is about making a remote for devices which works on Radio Frequencies. I decided to make this because there is a remote controlled shutter in my workshop, that works on radiofrequency remote. I earlier have two remotes for it (one extra as comes with it). But unfortunately my second remote malfunctioned, and there is no way to purchase a external remote without purchasing the complete set of the shutter, so i decided to make this remote with attiny which work same as that remote.

What i did is all that firstly i noted the radio frequencies of each buttons in the remote with the help of RF reciever, then i did experimented on a breadboard as shown in the pictures. It worked, then i thought to make pcb and a complete woeking remote for my shutter. Then i completed making a pcb design for the shutter remote with the help of Kicad. The remote works with the microchip Attiny 45 20su. It have 8 pins (6 in use + 2 power). Then i have used 433 Mhz emiiter and reciever modules (Mainly emitter is placed but i have desgined reciever also as optional). The frequency on which shutter works comes below 433 Mhz.

For uplaoding the codes into attiny microcontroller, I directly used the xtal pins to a usb connector as shown in picture below.