You should also have a look at Analog Flex Sensor Library for Proteus, which we have designed finally.
It's better to have something than nothing. So, its not gonna detect how much its bent but it will detect whether its up or bent. Although, I wanna add one thing here that most of the flex sensors are analog sensors and their resistance changes over bending and believe me I have tried my best to design an analog sensor but despite the efforts we couldn't so I am sharing a digital version of Flex Sensor. I am quite excited while sharing this one because we are the first one to design this library and share it online. In today's tutorial, I am going to share a new Proteus Library named as Flex Sensor Library for Proteus. Hello friends,I hope you all are fine and having fun with your lives.