Mr Lodge - who lives in South Yorkshire - has 20 years' experience in technology and developed Speaks4Me after deciding that other products on the market were unsatisfactory for Callum.
He cashed in his savings and raised money on his property in order to finance the venture.
Speaks4Me is currently sold on a portable, touch screen media player imported from the Far East.
But the company is finalising a "software only" price which will mean that it can run on any Windows laptop, desktop or even an interactive plasma white board in schools.
Mr Lodge says that several people have already tried the system.
"It's fabulous to see how such an exciting but simple concept is well understood by the children that have been introduced to it," he said.
Mr Lodge estimates it takes half an hour or less to be able to understand and use the system.
He is also hoping that it will prove useful to stroke survivors - about a third of whom lose the ability to speak, either temporarily or permanently.
"Imagine waking up in hospital, not being able to speak: how would you ask for the toilet?" he said.
Speaks4Me currently retails for about £2,000.
Mr Lodge says his future plans include being able to put his software on other portable devices such as mobile phones and gaming handsets.
Also having its UK launch at Naidex was a French product called the Minifone.
The device can summon help and take incoming calls
It is being sold in the UK by Essex-based PivoTell which describes the product as the world's smallest digital cordless phone.
Designed with older and disabled people in mind, the Minifone is worn like a wrist watch.
It can be used to summon help from three pre-programmed numbers and has the additional option of being connected to a call centre.
Provided that the landline has caller line identification (CLI) enabled, the Minifone will also display the date and time and the name or number of an incoming caller.
The Minifone uses a built-in speaker and microphone.
"The experience in France has been that - unlike alarm pendants which have a certain stigma attached - people find these quite attractive and so are more likely to be wearing them," said Adrian Milne of PivoTell.
The device costs £150 and a subscription to the call centre is £10 per month.
Naidex 2010 was at the National Exhibition Centre in Birmingham from 20 - 22 April.
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