Use clear and concise language with visual aids if possible to make it easy for beginners to follow along.

To create a DIY birdhouse using only recycled materials that can attract bluebirds or chickadees, you’ll need the following items:
– A wooden box (at least 6 inches wide by 8 inches deep and 12 inches tall) with a lid. You can use an old shoe box, a small storage container, or any other similar item that fits these dimensions.
– Drill
– Screws
– Sawtooth picture hangers
– Wood glue
– Sandpaper (medium grit)
– Paint or stain (optional)
– Birdseed and nesting material (such as twigs or grass)

Measurements:
– The entrance hole for bluebirds should be 1.5 inches in diameter, located about 6 inches from the bottom of the box.
– The entrance hole for chickadees can be smaller at around 1 inch in diameter and placed higher up on the side (around 8 inches from the top).

Instructions:
1. Clean out any debris or dirt inside the wooden box using a brush or vacuum cleaner. Sand down any rough edges with medium grit sandpaper to make it safe for birds.
2. If desired, paint or stain the outside of the birdhouse in a color that will blend in with your backyard environment (such as brown or green). Allow it to dry completely before proceeding.
3. Attach sawtooth picture hangers to the top corners of the box using wood glue and screws. This will allow you to easily mount the birdhouse on a tree, fence post, or other sturdy surface in your backyard.
4. Drill an entrance hole for bluebirds (or chickadees) according to the measurements provided above. Make sure it is centered and level with the ground when mounted.
5. Fill the inside of the birdhouse with nesting material such as twigs, grass, or feathers. This will provide a cozy home for birds to lay their eggs and raise their young.
6. Hang your new DIY birdhouse in a location that is safe and secure for birds. Make sure it is at least 5 feet off the ground and away from any potential predators (such as cats or raccoons).
7. Fill the birdhouse with birdseed to attract more birds to your backyard. You can also add a small perch near the entrance hole to make it easier for them to land and enter.
8. Enjoy watching the birds in action! Keep an eye on your DIY birdhouse throughout the season, and be sure to clean it out at least once a year (in late fall or early winter) to prevent any disease from spreading among the birds.