Prosecutors say Damon Smith left a knapsack filled with explosives and ball bearings on a London Underground train in October. An iPad Mini he told police he shared with his mother had a note titled "Pressure cooker bomb materials" dated a month before the incident.
After his arrest Smith, who has Asperger's syndrome, admitted making the device but claimed he only meant it to spew smoke as a prank.
Smith had a "keen interest in guns and other weapons", the prosecution alleges.
Pictures of Smith with guns were also recovered, including one on a laptop captioned: "2016 an Islamic State fighter".
The computer had been used to search for the ISIS propaganda magazine Dabiq around six weeks before the alleged bomb plot, it is said.
Prosecutor Jonathan Rees QC told how Smith grew up in Newton Abbot in Devon and moved to London with his mother in June a year ago before starting a London Metropolitan University computer course.
Smith gets off at London Bridge station, leaving behind his rucksack containing the bomb.
The abandoned bag was reported by passengers to the driver, who noticed it contained wires poking out of a clock.
Mr Rees said the bomb was timed to detonate just before 11am, telling jurors: "Had the device worked, it would have gone off while passengers were being ordered off the platform".
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After abandoning the bag on the Tube train, Smith went to his university campus at Holloway. Later that evening, he looked online for news of the bomb incident, the court heard.
The prosecution said Mr Smith intended the Improvised Explosive Device (IED) to explode and endanger the lives of people on the Jubilee Line train.
Jonathan Rees QC, for the prosecution, said this was to "increase the destructive effect of the device".
Mr Rees said: "He said that he had built a device which when activated was intended only to produce smoke - a smoke bomb".
On his faith, Smith allegedly told police he was brought up Christian, but Islam was "more true", although he denied being an extremist.
He did not really practise Islam, although he read the Quran and sometimes prayed in the morning when it was convenient but did not hold extreme views, the court heard. Police found a blank-firing self-loading pistol and a BB gun shaped like a revolver in his London home - both of which he legally owned - as well as a Mustang knife and a knuckleduster.
Detectives also found a picture of Smith posing with a gun and wearing a headscarf, the court heard.
When officers searched his home they found shredded documents which, when pieced back together, showed that he had written in green ink on a two-page feature in the...
Mr Rees said the iPad list ended with the words: "And keep this a secret between me and Allah #InspireTheBelievers". He denies the charge but has admitted the lesser offence of perpetrating a bomb hoax.
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