Low hanging fruit: donate old but still usable tech to local programs that pass such out. Volunteering at local organizations that do such work is another possibility.
If tech is your thing, coolios. Run with that. Better to do something than to do nothing.
But if you really want to make a dent in homelessness, my research suggests that this is mostly a housing supply/housing affordability issue. We aren't building enough new housing and what we do build tends to be too big and tends to require a car to make life work, which is an additional big expense and -- at least for some people -- a logistical issue even if they had the money. Some handicapped people simply don't drive. Some seniors simply don't drive anymore. Etc.
So if you really want to work on homelessness, I would encourage you to educate yourself about housing issues in your neck of the woods and try to get involved. I write about my ideas about what I would like to see for the US here if you want to look that over: https://projectsro.blogspot.com/
I wrote a piece called So You Want to do a Website to Help the Homeless that might interest you: https://streetlifesolutions.blogspot.com/2020/05/so-you-want...
The local police department does -- or did at one time -- pass out flyers I made listing online resources for the homeless and there is an edited version of those flyers here: http://www.eclogiselle.com/2020/10/free-and-custom-flyers-as...
I tried to establish some kind of homeless smartphone project. It never went anywhere. If you want to read what little I did as food for thought for what you might do, you can start here: https://streetlifesolutions.blogspot.com/2018/04/project-hom...
If tech is your thing, coolios. Run with that. Better to do something than to do nothing.
But if you really want to make a dent in homelessness, my research suggests that this is mostly a housing supply/housing affordability issue. We aren't building enough new housing and what we do build tends to be too big and tends to require a car to make life work, which is an additional big expense and -- at least for some people -- a logistical issue even if they had the money. Some handicapped people simply don't drive. Some seniors simply don't drive anymore. Etc.
So if you really want to work on homelessness, I would encourage you to educate yourself about housing issues in your neck of the woods and try to get involved. I write about my ideas about what I would like to see for the US here if you want to look that over: https://projectsro.blogspot.com/