Following this post by bram h here is how simple you can program this Arduino ISD1820 Voice Recorder & Playback Module,  using Otto Blockly and the same nano board.

1. Manual mode

Note that you can use it in manual mode meaning you only need a way to power Vcc and Gnd to make it work and you just press the rec button to record and any of the play buttons to play your recorded message.

2. ''Arduino'' Mode

You can program it by combining with Arduino sensors and and even other actuators to it by simply activating the extra signal pins that comes with it to control each command. combine it  endless possibilities

the resistor is optional
the resistor is optional

 

It has pins for Vcc and Gnd and then 3 main signal  pins , one for record and one for play/e (which is like play to end i guess) and play / l which you need to hold on to keep the audio running. There are other hacks like extend the play time you can do but keep it simple at start.

this code just turns on and off every 10 seconds
this code just turns on and off every 10 seconds

The real fun is when you combine it with other sensors for example I used the same touch sensor of Otto +plus

You can do more cool stuff of course like distance activation or light activation clap and even bluetooth to control from your phone you name it!

Basic wiring here  you can connect to other pins as your code
Basic wiring here  you can connect to other pins as your code

For better audio quality add an amplifier like the LM386 for example

What would you do with it @bram h @Bill SCHONFELDER ?