The aim of this study is to examine the effect of Micro:bit applications with the participation of 6th grade students on students' attitudes towards coding. In addition participants' opinion regarding Micro:bit applications were examined. In this quantitative study, six-week applications with Micro:bit coding content were carried out using the ASSURE instructional design model as an intervention. The study was conducted with the participation of 59 students studying in the 6th grade of secondary school. Research data were collected using a coding attitude scale and semi-structured interviews. Since the quantitative data showed normal distribution, the data set was analyzed with parametric tests. As a result of the dependent samples t-test, it was determined that the post-test average was higher than the pre-test average. In other words, Micro:bit applications positively affected the participants' attitudes towards coding. In addition, the participants reported many positive opinions about Micro:bit applications under the cognitive and affective categories. In line with the research data, suggestions have been made to include useful educational cards such as Micro:bit, one of the block-based applications, in courses such as Information Technologies and Software, as it can increase students' interest in the course, and expand its use in the future.